640105504626 has 64 divisors (see below), whose sum is σ = 1555987802112. Its totient is φ = 171370889472.

The previous prime is 640105504583. The next prime is 640105504669. The reversal of 640105504626 is 626405501046.

It is an interprime number because it is at equal distance from previous prime (640105504583) and next prime (640105504669).

It is a super-2 number, since 2×640105504626² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1812606 + ... + 2136761.

It is an arithmetic number, because the mean of its divisors is an integer number (24312309408).

Almost surely, 2^640105504626 is an apocalyptic number.

640105504626 is an abundant number, since it is smaller than the sum of its proper divisors (915882297486).

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

640105504626 is a wasteful number, since it uses less digits than its factorization.

640105504626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949623.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 640105504626 in words is "six hundred forty billion, one hundred five million, five hundred four thousand, six hundred twenty-six".