640324211625 has 48 divisors (see below), whose sum is σ = 1319189858688. Its totient is φ = 292719636000.

The previous prime is 640324211551. The next prime is 640324211629. The reversal of 640324211625 is 526112423046.

640324211625 is a `hidden beast` number, since 6 + 4 + 0 + 3 + 2 + 4 + 21 + 1 + 625 = 666.

It is not a de Polignac number, because 640324211625 - 2¹² = 640324207529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640324211625.

It is not an unprimeable number, because it can be changed into a prime (640324211629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40647631 + ... + 40663380.

It is an arithmetic number, because the mean of its divisors is an integer number (27483122056).

Almost surely, 2^640324211625 is an apocalyptic number.

It is an amenable number.

640324211625 is an abundant number, since it is smaller than the sum of its proper divisors (678865647063).

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

640324211625 is a wasteful number, since it uses less digits than its factorization.

640324211625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81311039 (or 81311026 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 640324211625 in words is "six hundred forty billion, three hundred twenty-four million, two hundred eleven thousand, six hundred twenty-five".