640386586138 has 32 divisors (see below), whose sum is σ = 1042872566400. Its totient is φ = 293166409536.

The previous prime is 640386586129. The next prime is 640386586153. The reversal of 640386586138 is 831685683046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3869043 + ... + 4031161.

It is an arithmetic number, because the mean of its divisors is an integer number (32589767700).

Almost surely, 2^640386586138 is an apocalyptic number.

640386586138 is a deficient number, since it is larger than the sum of its proper divisors (402485980262).

640386586138 is a wasteful number, since it uses less digits than its factorization.

640386586138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163366.

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 640386586138 in words is "six hundred forty billion, three hundred eighty-six million, five hundred eighty-six thousand, one hundred thirty-eight".