626664672055664 has 40 divisors (see below), whose sum is σ = 1324851219480432. Its totient is φ = 284780915665920.

The previous prime is 626664672055651. The next prime is 626664672055699. The reversal of 626664672055664 is 466550276466626.

It is a happy number.

It is a super-2 number, since 2×626664672055664² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415886699 + ... + 417390794.

Almost surely, 2^{626664672055664} is an apocalyptic number.

It is an amenable number.

626664672055664 is an abundant number, since it is smaller than the sum of its proper divisors (698186547424768).

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

626664672055664 is a wasteful number, since it uses less digits than its factorization.

626664672055664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833281785 (or 833281779 counting only the distinct ones).

The product of its (nonzero) digits is 3135283200, while the sum is 71.

The spelling of 626664672055664 in words is "six hundred twenty-six trillion, six hundred sixty-four billion, six hundred seventy-two million, fifty-five thousand, six hundred sixty-four".