642606572957688 has 48 divisors (see below), whose sum is σ = 1741724395589880. Its totient is φ = 214038302514624.

The previous prime is 642606572957659. The next prime is 642606572957711. The reversal of 642606572957688 is 886759275606246.

642606572957688 is a `hidden beast` number, since 6 + 4 + 260 + 6 + 5 + 7 + 295 + 7 + 68 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3414248395 + ... + 3414436602.

Almost surely, 2^{642606572957688} is an apocalyptic number.

It is an amenable number.

642606572957688 is an abundant number, since it is smaller than the sum of its proper divisors (1099117822632192).

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

642606572957688 is a wasteful number, since it uses less digits than its factorization.

642606572957688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828686316 (or 6828686309 counting only the distinct ones).

The product of its (nonzero) digits is 14631321600, while the sum is 81.

The spelling of 642606572957688 in words is "six hundred forty-two trillion, six hundred six billion, five hundred seventy-two million, nine hundred fifty-seven thousand, six hundred eighty-eight".