623975566401 has 64 divisors (see below), whose sum is σ = 1016874086400. Its totient is φ = 375017947200.

The previous prime is 623975566397. The next prime is 623975566483. The reversal of 623975566401 is 104665579326.

623975566401 is a `hidden beast` number, since 6 + 2 + 3 + 9 + 75 + 566 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 623975566401 - 2² = 623975566397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623975566901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19494831 + ... + 19526811.

It is an arithmetic number, because the mean of its divisors is an integer number (15888657600).

Almost surely, 2^623975566401 is an apocalyptic number.

It is an amenable number.

623975566401 is a deficient number, since it is larger than the sum of its proper divisors (392898519999).

623975566401 is a wasteful number, since it uses less digits than its factorization.

623975566401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32547 (or 32541 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 623975566401 in words is "six hundred twenty-three billion, nine hundred seventy-five million, five hundred sixty-six thousand, four hundred one".