643151056 has 20 divisors (see below), whose sum is σ = 1253755072. Its totient is φ = 319601376.

The previous prime is 643151029. The next prime is 643151063. The reversal of 643151056 is 650151346.

It is a congruent number.

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, 120696 + ... + 125911.

Almost surely, 2^643151056 is an apocalyptic number.

It is an amenable number.

643151056 is a deficient number, since it is larger than the sum of its proper divisors (610604016).

643151056 is a wasteful number, since it uses less digits than its factorization.

643151056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246778 (or 246772 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 643151056 is about 25360.4230248630. The cubic root of 643151056 is about 863.1858829325.

The spelling of 643151056 in words is "six hundred forty-three million, one hundred fifty-one thousand, fifty-six".