643034955 has 32 divisors (see below), whose sum is σ = 1103466240. Its totient is φ = 318764160.

The previous prime is 643034941. The next prime is 643034971. The reversal of 643034955 is 559430346.

It is not a de Polignac number, because 643034955 - 2⁷ = 643034827 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6181 + ... + 36390.

It is an arithmetic number, because the mean of its divisors is an integer number (34483320).

Almost surely, 2^643034955 is an apocalyptic number.

643034955 is a deficient number, since it is larger than the sum of its proper divisors (460431285).

643034955 is a wasteful number, since it uses less digits than its factorization.

643034955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42651.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 643034955 is about 25358.1339021624. The cubic root of 643034955 is about 863.1339393161.

The spelling of 643034955 in words is "six hundred forty-three million, thirty-four thousand, nine hundred fifty-five".