391640141625 has 16 divisors (see below), whose sum is σ = 651689196288. Its totient is φ = 208874742000.

The previous prime is 391640141621. The next prime is 391640141689. The reversal of 391640141625 is 526141046193.

It is a happy number.

It is not a de Polignac number, because 391640141625 - 2² = 391640141621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391640141621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522186481 + ... + 522187230.

It is an arithmetic number, because the mean of its divisors is an integer number (40730574768).

Almost surely, 2^391640141625 is an apocalyptic number.

It is an amenable number.

391640141625 is a deficient number, since it is larger than the sum of its proper divisors (260049054663).

391640141625 is a wasteful number, since it uses less digits than its factorization.

391640141625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044373729 (or 1044373719 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 391640141625 in words is "three hundred ninety-one billion, six hundred forty million, one hundred forty-one thousand, six hundred twenty-five".