660451885056 has 260 divisors, whose sum is σ = 1981322071212. Its totient is φ = 220150628352.

The previous prime is 660451884979. The next prime is 660451885061. The reversal of 660451885056 is 650588154066.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Jordan-Polya number, since it can be written as (4!)⁸ ⋅ 3!.

660451885056 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 51 + 88 + 505 + 6 = 666.

It is a super-2 number, since 2×660451885056² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 660451884993 and 660451885011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 220150628351 + 220150628352 + 220150628353.

Almost surely, 2^660451885056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660451885056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990661035606).

660451885056 is an abundant number, since it is smaller than the sum of its proper divisors (1320870186156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660451885056 is an frugal number, since it uses more digits than its factorization.

660451885056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 5 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

Multiplying 660451885056 by its sum of digits (54), we get a square (35664401793024 = 5971968²).

660451885056 divided by its sum of digits (54) gives a 6-th power (12230590464 = 48⁶).

The spelling of 660451885056 in words is "six hundred sixty billion, four hundred fifty-one million, eight hundred eighty-five thousand, fifty-six".