640132875808 has 12 divisors (see below), whose sum is σ = 1260261599310. Its totient is φ = 320066437888.

The previous prime is 640132875803. The next prime is 640132875839. The reversal of 640132875808 is 808578231046.

It can be written as a sum of positive squares in only one way, i.e., 597757829904 + 42375045904 = 773148^2 + 205852^2 .

It is not an unprimeable number, because it can be changed into a prime (640132875803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002076153 + ... + 10002076216.

Almost surely, 2^640132875808 is an apocalyptic number.

It is an amenable number.

640132875808 is a deficient number, since it is larger than the sum of its proper divisors (620128723502).

640132875808 is a wasteful number, since it uses less digits than its factorization.

640132875808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004152379 (or 20004152371 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 640132875808 in words is "six hundred forty billion, one hundred thirty-two million, eight hundred seventy-five thousand, eight hundred eight".