643246631166 has 48 divisors (see below), whose sum is σ = 1314392288400. Its totient is φ = 209859378816.

The previous prime is 643246631147. The next prime is 643246631177. The reversal of 643246631166 is 661136642346.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4715650 + ... + 4850138.

It is an arithmetic number, because the mean of its divisors is an integer number (27383172675).

Almost surely, 2^643246631166 is an apocalyptic number.

643246631166 is an abundant number, since it is smaller than the sum of its proper divisors (671145657234).

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

643246631166 is a wasteful number, since it uses less digits than its factorization.

643246631166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134841 (or 134782 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 48.

The spelling of 643246631166 in words is "six hundred forty-three billion, two hundred forty-six million, six hundred thirty-one thousand, one hundred sixty-six".