626438969856 has 640 divisors, whose sum is σ = 2256419151360. Its totient is φ = 167512375296.

The previous prime is 626438969831. The next prime is 626438969869. The reversal of 626438969856 is 658969834626.

626438969856 is a `hidden beast` number, since 6 + 26 + 438 + 96 + 9 + 85 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 324075066 + ... + 324076998.

It is an arithmetic number, because the mean of its divisors is an integer number (3525654924).

Almost surely, 2^626438969856 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 626438969856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128209575680).

626438969856 is an abundant number, since it is smaller than the sum of its proper divisors (1629980181504).

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

626438969856 is a wasteful number, since it uses less digits than its factorization.

626438969856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2159 counting only the distinct ones).

The product of its digits is 806215680, while the sum is 72.

The spelling of 626438969856 in words is "six hundred twenty-six billion, four hundred thirty-eight million, nine hundred sixty-nine thousand, eight hundred fifty-six".