645874549100 has 36 divisors (see below), whose sum is σ = 1528961207928. Its totient is φ = 234863472000.

The previous prime is 645874549009. The next prime is 645874549141. The reversal of 645874549100 is 1945478546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293578241 + ... + 293580440.

Almost surely, 2^645874549100 is an apocalyptic number.

It is an amenable number.

645874549100 is an abundant number, since it is smaller than the sum of its proper divisors (883086658828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645874549100 is a wasteful number, since it uses less digits than its factorization.

645874549100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587158706 (or 587158699 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 645874549100 in words is "six hundred forty-five billion, eight hundred seventy-four million, five hundred forty-nine thousand, one hundred".