640324403631 has 160 divisors (see below), whose sum is σ = 1097086478400. Its totient is φ = 368731699200.

The previous prime is 640324403627. The next prime is 640324403671. The reversal of 640324403631 is 136304423046.

640324403631 is a `hidden beast` number, since 6 + 403 + 244 + 0 + 3 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 640324403631 - 2² = 640324403627 is a prime.

It is a super-2 number, since 2×640324403631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640324403611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 299635995 + ... + 299638131.

It is an arithmetic number, because the mean of its divisors is an integer number (6856790490).

Almost surely, 2^640324403631 is an apocalyptic number.

640324403631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

640324403631 is a deficient number, since it is larger than the sum of its proper divisors (456762074769).

640324403631 is a wasteful number, since it uses less digits than its factorization.

640324403631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

Adding to 640324403631 its reverse (136304423046), we get a palindrome (776628826677).

The spelling of 640324403631 in words is "six hundred forty billion, three hundred twenty-four million, four hundred three thousand, six hundred thirty-one".