641172809408 has 28 divisors (see below), whose sum is σ = 1291317261912. Its totient is φ = 315801530880.

The previous prime is 641172809357. The next prime is 641172809419. The reversal of 641172809408 is 804908271146.

It is a super-2 number, since 2×641172809408² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

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, 74759333 + ... + 74767908.

Almost surely, 2^641172809408 is an apocalyptic number.

It is an amenable number.

641172809408 is an abundant number, since it is smaller than the sum of its proper divisors (650144452504).

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

641172809408 is a wasteful number, since it uses less digits than its factorization.

641172809408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149527320 (or 149527310 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 641172809408 in words is "six hundred forty-one billion, one hundred seventy-two million, eight hundred nine thousand, four hundred eight".