18787164451 has 32 divisors (see below), whose sum is σ = 22584614400. Its totient is φ = 15426766080.

The previous prime is 18787164397. The next prime is 18787164481. The reversal of 18787164451 is 15446178781.

It is not a de Polignac number, because 18787164451 - 2⁹ = 18787163939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18787164481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1517655 + ... + 1529983.

It is an arithmetic number, because the mean of its divisors is an integer number (705769200).

Almost surely, 2^18787164451 is an apocalyptic number.

18787164451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18787164451 is a deficient number, since it is larger than the sum of its proper divisors (3797449949).

18787164451 is a wasteful number, since it uses less digits than its factorization.

18787164451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12699.

The product of its digits is 1505280, while the sum is 52.

It can be divided in two parts, 1878 and 7164451, that added together give a square (7166329 = 2677²).

The spelling of 18787164451 in words is "eighteen billion, seven hundred eighty-seven million, one hundred sixty-four thousand, four hundred fifty-one".