626639987566540 has 48 divisors (see below), whose sum is σ = 1329755338447200. Its totient is φ = 248028180364800.

The previous prime is 626639987566531. The next prime is 626639987566573. The reversal of 626639987566540 is 45665789936626.

It is a Smith number, since the sum of its digits (82) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87862257 + ... + 94726216.

It is an arithmetic number, because the mean of its divisors is an integer number (27703236217650).

Almost surely, 2^{626639987566540} is an apocalyptic number.

It is an amenable number.

626639987566540 is an abundant number, since it is smaller than the sum of its proper divisors (703115350880660).

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

626639987566540 is a wasteful number, since it uses less digits than its factorization.

626639987566540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182590282 (or 182590280 counting only the distinct ones).

The product of its (nonzero) digits is 21163161600, while the sum is 82.

The spelling of 626639987566540 in words is "six hundred twenty-six trillion, six hundred thirty-nine billion, nine hundred eighty-seven million, five hundred sixty-six thousand, five hundred forty".