640763414906 has 16 divisors (see below), whose sum is σ = 961919411208. Its totient is φ = 320123707200.

The previous prime is 640763414903. The next prime is 640763414947. The reversal of 640763414906 is 609414367046.

640763414906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 520260706681 + 120502708225 = 721291^2 + 347135^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640763414903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15213116 + ... + 15255176.

Almost surely, 2^640763414906 is an apocalyptic number.

640763414906 is a deficient number, since it is larger than the sum of its proper divisors (321155996302).

640763414906 is a wasteful number, since it uses less digits than its factorization.

640763414906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48017.

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 640763414906 in words is "six hundred forty billion, seven hundred sixty-three million, four hundred fourteen thousand, nine hundred six".