640503460521 has 48 divisors (see below), whose sum is σ = 948269911680. Its totient is φ = 416512857600.

The previous prime is 640503460451. The next prime is 640503460549. The reversal of 640503460521 is 125064305046.

640503460521 is a `hidden beast` number, since 6 + 40 + 5 + 0 + 3 + 4 + 605 + 2 + 1 = 666.

It is not a de Polignac number, because 640503460521 - 2¹⁴ = 640503444137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640503460561) 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 47 ways as a sum of consecutive naturals, for example, 17135070 + ... + 17172408.

It is an arithmetic number, because the mean of its divisors is an integer number (19755623160).

Almost surely, 2^640503460521 is an apocalyptic number.

It is an amenable number.

640503460521 is a deficient number, since it is larger than the sum of its proper divisors (307766451159).

640503460521 is a wasteful number, since it uses less digits than its factorization.

640503460521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37726 (or 37723 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 640503460521 its reverse (125064305046), we get a palindrome (765567765567).

The spelling of 640503460521 in words is "six hundred forty billion, five hundred three million, four hundred sixty thousand, five hundred twenty-one".