18506911465156 has 81 divisors (see below), whose sum is σ = 34717581010119. Its totient is φ = 8631464582400.

The previous prime is 18506911465117. The next prime is 18506911465157. The reversal of 18506911465156 is 65156411960581.

The square root of 18506911465156 is 4301966.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3675786210756 + 14831125254400 = 1917234^2 + 3851120^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18506911465156.

It is not an unprimeable number, because it can be changed into a prime (18506911465157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8113506736 + ... + 8113509016.

Almost surely, 2^{18506911465156} is an apocalyptic number.

18506911465156 is the 4301966-th square number.

It is an amenable number.

18506911465156 is a deficient number, since it is larger than the sum of its proper divisors (16210669544963).

18506911465156 is an frugal number, since it uses more digits than its factorization.

18506911465156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 58.

The spelling of 18506911465156 in words is "eighteen trillion, five hundred six billion, nine hundred eleven million, four hundred sixty-five thousand, one hundred fifty-six".