643458801 has 12 divisors (see below), whose sum is σ = 862843056. Its totient is φ = 426537360.

The previous prime is 643458793. The next prime is 643458817. The reversal of 643458801 is 108854346.

It is not a de Polignac number, because 643458801 - 2³ = 643458793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643458801.

It is not an unprimeable number, because it can be changed into a prime (643458401) 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, 95010 + ... + 101556.

It is an arithmetic number, because the mean of its divisors is an integer number (71903588).

Almost surely, 2^643458801 is an apocalyptic number.

It is an amenable number.

643458801 is a deficient number, since it is larger than the sum of its proper divisors (219384255).

643458801 is an equidigital number, since it uses as much as digits as its factorization.

643458801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912 (or 6731 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 643458801 is about 25366.4897256203. The cubic root of 643458801 is about 863.3235378836.

The spelling of 643458801 in words is "six hundred forty-three million, four hundred fifty-eight thousand, eight hundred one".