643416555 has 32 divisors (see below), whose sum is σ = 1063756800. Its totient is φ = 331909760.

The previous prime is 643416547. The next prime is 643416577. The reversal of 643416555 is 555614346.

It is not a de Polignac number, because 643416555 - 2³ = 643416547 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, 50746 + ... + 62144.

It is an arithmetic number, because the mean of its divisors is an integer number (33242400).

Almost surely, 2^643416555 is an apocalyptic number.

643416555 is a deficient number, since it is larger than the sum of its proper divisors (420340245).

643416555 is a wasteful number, since it uses less digits than its factorization.

643416555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11531.

The product of its digits is 216000, while the sum is 39.

The square root of 643416555 is about 25365.6569991790. The cubic root of 643416555 is about 863.3046437630.

The spelling of 643416555 in words is "six hundred forty-three million, four hundred sixteen thousand, five hundred fifty-five".