18189637904 has 10 divisors (see below), whose sum is σ = 35242423470. Its totient is φ = 9094818944.

The previous prime is 18189637877. The next prime is 18189637913. The reversal of 18189637904 is 40973698181.

It can be written as a sum of positive squares in only one way, i.e., 11267397904 + 6922240000 = 106148^2 + 83200^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18189637904.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568426169 + ... + 568426200.

It is an arithmetic number, because the mean of its divisors is an integer number (3524242347).

Almost surely, 2^18189637904 is an apocalyptic number.

It is an amenable number.

18189637904 is a deficient number, since it is larger than the sum of its proper divisors (17052785566).

18189637904 is a wasteful number, since it uses less digits than its factorization.

18189637904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136852377 (or 1136852371 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 18189637904 in words is "eighteen billion, one hundred eighty-nine million, six hundred thirty-seven thousand, nine hundred four".