18923402863 has 4 divisors (see below), whose sum is σ = 19006038040. Its totient is φ = 18840767688.

The previous prime is 18923402843. The next prime is 18923402873. The reversal of 18923402863 is 36820432981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18923402863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923402843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41317245 + ... + 41317702.

It is an arithmetic number, because the mean of its divisors is an integer number (4751509510).

Almost surely, 2^18923402863 is an apocalyptic number.

18923402863 is a deficient number, since it is larger than the sum of its proper divisors (82635177).

18923402863 is an equidigital number, since it uses as much as digits as its factorization.

18923402863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82635176.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 18923402863 in words is "eighteen billion, nine hundred twenty-three million, four hundred two thousand, eight hundred sixty-three".