660855274560 has 1344 divisors, whose sum is σ = 2714846284800. Its totient is φ = 150716547072.

The previous prime is 660855274537. The next prime is 660855274589. The reversal of 660855274560 is 65472558066.

660855274560 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 5 + 5 + 2 + 74 + 560 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 660855274497 and 660855274506.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1960994712 + ... + 1960995048.

Almost surely, 2^660855274560 is an apocalyptic number.

660855274560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660855274560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357423142400).

660855274560 is an abundant number, since it is smaller than the sum of its proper divisors (2053991010240).

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

660855274560 is a wasteful number, since it uses less digits than its factorization.

660855274560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 54.

The spelling of 660855274560 in words is "six hundred sixty billion, eight hundred fifty-five million, two hundred seventy-four thousand, five hundred sixty".