643156402874 has 8 divisors (see below), whose sum is σ = 965558463168. Its totient is φ = 321303581820.

The previous prime is 643156402841. The next prime is 643156402883. The reversal of 643156402874 is 478204651346.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 137306882 + ... + 137311565.

It is an arithmetic number, because the mean of its divisors is an integer number (120694807896).

Almost surely, 2^643156402874 is an apocalyptic number.

643156402874 is a deficient number, since it is larger than the sum of its proper divisors (322402060294).

643156402874 is a wasteful number, since it uses less digits than its factorization.

643156402874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274619620.

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 643156402874 in words is "six hundred forty-three billion, one hundred fifty-six million, four hundred two thousand, eight hundred seventy-four".