646689552576 has 112 divisors (see below), whose sum is σ = 1771589283840. Its totient is φ = 207947084800.

The previous prime is 646689552559. The next prime is 646689552581. The reversal of 646689552576 is 675255986646.

It is a self number, because there is not a number n which added to its sum of digits gives 646689552576.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6358315 + ... + 6459221.

Almost surely, 2^646689552576 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 646689552576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885794641920).

646689552576 is an abundant number, since it is smaller than the sum of its proper divisors (1124899731264).

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

646689552576 is a wasteful number, since it uses less digits than its factorization.

646689552576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102102 (or 102092 counting only the distinct ones).

The product of its digits is 653184000, while the sum is 69.

The spelling of 646689552576 in words is "six hundred forty-six billion, six hundred eighty-nine million, five hundred fifty-two thousand, five hundred seventy-six".