640552152506631 has 24 divisors (see below), whose sum is σ = 907266728641104. Its totient is φ = 401913946644480.

The previous prime is 640552152506599. The next prime is 640552152506641. The reversal of 640552152506631 is 136605251255046.

It is not a de Polignac number, because 640552152506631 - 2⁵ = 640552152506599 is a prime.

It is a super-2 number, since 2×640552152506631² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640552152506641) 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 23 ways as a sum of consecutive naturals, for example, 394553191 + ... + 396173351.

It is an arithmetic number, because the mean of its divisors is an integer number (37802780360046).

Almost surely, 2^{640552152506631} is an apocalyptic number.

640552152506631 is a deficient number, since it is larger than the sum of its proper divisors (266714576134473).

640552152506631 is a wasteful number, since it uses less digits than its factorization.

640552152506631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076211 (or 2076194 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 51.

The spelling of 640552152506631 in words is "six hundred forty trillion, five hundred fifty-two billion, one hundred fifty-two million, five hundred six thousand, six hundred thirty-one".