18986033523 has 16 divisors (see below), whose sum is σ = 25667793920. Its totient is φ = 12480899904.

The previous prime is 18986033513. The next prime is 18986033527. The reversal of 18986033523 is 32533068981.

It is a happy number.

It is not a de Polignac number, because 18986033523 - 2¹² = 18986029427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18986033527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1191990 + ... + 1207812.

It is an arithmetic number, because the mean of its divisors is an integer number (1604237120).

Almost surely, 2^18986033523 is an apocalyptic number.

18986033523 is a deficient number, since it is larger than the sum of its proper divisors (6681760397).

18986033523 is a wasteful number, since it uses less digits than its factorization.

18986033523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21378.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 18986033523 in words is "eighteen billion, nine hundred eighty-six million, thirty-three thousand, five hundred twenty-three".