18712661823 has 32 divisors (see below), whose sum is σ = 28603238400. Its totient is φ = 12084722208.

The previous prime is 18712661819. The next prime is 18712661837. The reversal of 18712661823 is 32816621781.

18712661823 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 2 + 6 + 618 + 23 = 666.

It is not a de Polignac number, because 18712661823 - 2² = 18712661819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18712661323) 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, 30286 + ... + 195812.

It is an arithmetic number, because the mean of its divisors is an integer number (893851200).

Almost surely, 2^18712661823 is an apocalyptic number.

18712661823 is a deficient number, since it is larger than the sum of its proper divisors (9890576577).

18712661823 is a wasteful number, since it uses less digits than its factorization.

18712661823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165668 (or 165662 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 18712661823 in words is "eighteen billion, seven hundred twelve million, six hundred sixty-one thousand, eight hundred twenty-three".