626044640464 has 20 divisors (see below), whose sum is σ = 1214163664420. Its totient is φ = 312712081920.

The previous prime is 626044640453. The next prime is 626044640479. The reversal of 626044640464 is 464046440626.

It can be written as a sum of positive squares in 2 ways, for example, as 213998760000 + 412045880464 = 462600^2 + 641908^2 .

It is a super-2 number, since 2×626044640464² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19373247 + ... + 19405534.

It is an arithmetic number, because the mean of its divisors is an integer number (60708183221).

Almost surely, 2^626044640464 is an apocalyptic number.

It is an amenable number.

626044640464 is a deficient number, since it is larger than the sum of its proper divisors (588119023956).

626044640464 is a wasteful number, since it uses less digits than its factorization.

626044640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38779798 (or 38779792 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 46.

The spelling of 626044640464 in words is "six hundred twenty-six billion, forty-four million, six hundred forty thousand, four hundred sixty-four".