643136177832 has 64 divisors (see below), whose sum is σ = 1630434484800. Its totient is φ = 211387038720.

The previous prime is 643136177819. The next prime is 643136177869. The reversal of 643136177832 is 238771631346.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157857 + ... + 1145072.

It is an arithmetic number, because the mean of its divisors is an integer number (25475538825).

Almost surely, 2^643136177832 is an apocalyptic number.

It is an amenable number.

643136177832 is an abundant number, since it is smaller than the sum of its proper divisors (987298306968).

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

643136177832 is a wasteful number, since it uses less digits than its factorization.

643136177832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303226 (or 1303222 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 51.

The spelling of 643136177832 in words is "six hundred forty-three billion, one hundred thirty-six million, one hundred seventy-seven thousand, eight hundred thirty-two".