646070811660 has 384 divisors, whose sum is σ = 2096156160000. Its totient is φ = 167168821248.

The previous prime is 646070811629. The next prime is 646070811709. The reversal of 646070811660 is 66118070646.

646070811660 is a `hidden beast` number, since 6 + 460 + 70 + 8 + 116 + 6 + 0 = 666.

It is a super-2 number, since 2×646070811660² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 203870556 + ... + 203873724.

It is an arithmetic number, because the mean of its divisors is an integer number (5458740000).

Almost surely, 2^646070811660 is an apocalyptic number.

646070811660 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 646070811660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048078080000).

646070811660 is an abundant number, since it is smaller than the sum of its proper divisors (1450085348340).

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

646070811660 is a wasteful number, since it uses less digits than its factorization.

646070811660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337 (or 3317 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 646070811660 in words is "six hundred forty-six billion, seventy million, eight hundred eleven thousand, six hundred sixty".