640631415633 has 64 divisors (see below), whose sum is σ = 957432960000. Its totient is φ = 377737240320.

The previous prime is 640631415631. The next prime is 640631415701. The reversal of 640631415633 is 336514136046.

It is not a de Polignac number, because 640631415633 - 2¹ = 640631415631 is a prime.

It is a super-2 number, since 2×640631415633² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640631415631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 309632323 + ... + 309634391.

It is an arithmetic number, because the mean of its divisors is an integer number (14959890000).

Almost surely, 2^640631415633 is an apocalyptic number.

It is an amenable number.

640631415633 is a deficient number, since it is larger than the sum of its proper divisors (316801544367).

640631415633 is a wasteful number, since it uses less digits than its factorization.

640631415633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 640631415633 in words is "six hundred forty billion, six hundred thirty-one million, four hundred fifteen thousand, six hundred thirty-three".