18742774564 has 6 divisors (see below), whose sum is σ = 32799855494. Its totient is φ = 9371387280.

The previous prime is 18742774553. The next prime is 18742774579. The reversal of 18742774564 is 46547724781.

It can be written as a sum of positive squares in only one way, i.e., 18711504100 + 31270464 = 136790^2 + 5592^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2342846817 + ... + 2342846824.

Almost surely, 2^18742774564 is an apocalyptic number.

It is an amenable number.

18742774564 is a deficient number, since it is larger than the sum of its proper divisors (14057080930).

18742774564 is a wasteful number, since it uses less digits than its factorization.

18742774564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685693645 (or 4685693643 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 55.

The spelling of 18742774564 in words is "eighteen billion, seven hundred forty-two million, seven hundred seventy-four thousand, five hundred sixty-four".