640131066004 has 12 divisors (see below), whose sum is σ = 1120235946228. Its totient is φ = 320063652800.

The previous prime is 640131065993. The next prime is 640131066059. The reversal of 640131066004 is 400660131046.

It can be written as a sum of positive squares in 2 ways, for example, as 104394902404 + 535736163600 = 323102^2 + 731940^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534534 + ... + 1251394.

It is an arithmetic number, because the mean of its divisors is an integer number (93352995519).

Almost surely, 2^640131066004 is an apocalyptic number.

It is an amenable number.

640131066004 is a deficient number, since it is larger than the sum of its proper divisors (480104880224).

640131066004 is a wasteful number, since it uses less digits than its factorization.

640131066004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940106 (or 940104 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 640131066004 in words is "six hundred forty billion, one hundred thirty-one million, sixty-six thousand, four".