643133563074 has 24 divisors (see below), whose sum is σ = 1403480922480. Its totient is φ = 212835566808.

The previous prime is 643133563073. The next prime is 643133563123. The reversal of 643133563074 is 470365331346.

643133563074 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 3 + 3 + 5 + 630 + 7 + 4 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643133563073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128521392 + ... + 128526395.

It is an arithmetic number, because the mean of its divisors is an integer number (58478371770).

Almost surely, 2^643133563074 is an apocalyptic number.

643133563074 is an abundant number, since it is smaller than the sum of its proper divisors (760347359406).

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

643133563074 is a wasteful number, since it uses less digits than its factorization.

643133563074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257047934 (or 257047931 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 45.

The spelling of 643133563074 in words is "six hundred forty-three billion, one hundred thirty-three million, five hundred sixty-three thousand, seventy-four".