18644745002 has 32 divisors (see below), whose sum is σ = 32218944912. Its totient is φ = 8015560704.

The previous prime is 18644744981. The next prime is 18644745017. The reversal of 18644745002 is 20054744681.

It can be written as a sum of positive squares in 8 ways, for example, as 12599838001 + 6044907001 = 112249^2 + 77749^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174563 + ... + 260310.

Almost surely, 2^18644745002 is an apocalyptic number.

18644745002 is a deficient number, since it is larger than the sum of its proper divisors (13574199910).

18644745002 is a wasteful number, since it uses less digits than its factorization.

18644745002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435002.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 18644745002 in words is "eighteen billion, six hundred forty-four million, seven hundred forty-five thousand, two".