18038856658 has 16 divisors (see below), whose sum is σ = 27642790296. Its totient is φ = 8825506560.

The previous prime is 18038856653. The next prime is 18038856659. The reversal of 18038856658 is 85665883081.

It can be written as a sum of positive squares in 4 ways, for example, as 13352495809 + 4686360849 = 115553^2 + 68457^2 .

It is not an unprimeable number, because it can be changed into a prime (18038856653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188583 + ... + 267658.

Almost surely, 2^18038856658 is an apocalyptic number.

18038856658 is a deficient number, since it is larger than the sum of its proper divisors (9603933638).

18038856658 is a wasteful number, since it uses less digits than its factorization.

18038856658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456669.

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 18038856658 in words is "eighteen billion, thirty-eight million, eight hundred fifty-six thousand, six hundred fifty-eight".