163640626725 has 48 divisors (see below), whose sum is σ = 277711225344. Its totient is φ = 84994080000.

The previous prime is 163640626691. The next prime is 163640626769. The reversal of 163640626725 is 527626046361.

It is not a de Polignac number, because 163640626725 - 2¹¹ = 163640624677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285004 + ... + 639146.

It is an arithmetic number, because the mean of its divisors is an integer number (5785650528).

Almost surely, 2^163640626725 is an apocalyptic number.

163640626725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163640626725 is a deficient number, since it is larger than the sum of its proper divisors (114070598619).

163640626725 is a wasteful number, since it uses less digits than its factorization.

163640626725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354318 (or 354313 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 163640626725 in words is "one hundred sixty-three billion, six hundred forty million, six hundred twenty-six thousand, seven hundred twenty-five".