18663924123 has 32 divisors (see below), whose sum is σ = 30281932800. Its totient is φ = 11290809888.

The previous prime is 18663924119. The next prime is 18663924137. The reversal of 18663924123 is 32142936681.

18663924123 is a `hidden beast` number, since 1 + 8 + 6 + 639 + 2 + 4 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 18663924123 - 2² = 18663924119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18663924173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429915 + ... + 471332.

It is an arithmetic number, because the mean of its divisors is an integer number (946310400).

Almost surely, 2^18663924123 is an apocalyptic number.

18663924123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18663924123 is a deficient number, since it is larger than the sum of its proper divisors (11618008677).

18663924123 is a wasteful number, since it uses less digits than its factorization.

18663924123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901328 (or 901322 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 18663924123 in words is "eighteen billion, six hundred sixty-three million, nine hundred twenty-four thousand, one hundred twenty-three".