18931674745 has 16 divisors (see below), whose sum is σ = 23343396048. Its totient is φ = 14728815360.

The previous prime is 18931674661. The next prime is 18931674779. The reversal of 18931674745 is 54747613981.

It can be written as a sum of positive squares in 8 ways, for example, as 3281914944 + 15649759801 = 57288^2 + 125099^2 .

It is not a de Polignac number, because 18931674745 - 2²⁵ = 18898120313 is a prime.

It is a Duffinian number.

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, 372187 + ... + 419983.

It is an arithmetic number, because the mean of its divisors is an integer number (1458962253).

Almost surely, 2^18931674745 is an apocalyptic number.

It is an amenable number.

18931674745 is a deficient number, since it is larger than the sum of its proper divisors (4411721303).

18931674745 is a wasteful number, since it uses less digits than its factorization.

18931674745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49980.

The product of its digits is 5080320, while the sum is 55.

The spelling of 18931674745 in words is "eighteen billion, nine hundred thirty-one million, six hundred seventy-four thousand, seven hundred forty-five".