18538958031 has 16 divisors (see below), whose sum is σ = 28551979008. Its totient is φ = 10574806400.

The previous prime is 18538958023. The next prime is 18538958041. The reversal of 18538958031 is 13085983581.

It is a cyclic number.

It is not a de Polignac number, because 18538958031 - 2³ = 18538958023 is a prime.

It is a super-2 number, since 2×18538958031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538958021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16522575 + ... + 16523696.

It is an arithmetic number, because the mean of its divisors is an integer number (1784498688).

Almost surely, 2^18538958031 is an apocalyptic number.

18538958031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18538958031 is a deficient number, since it is larger than the sum of its proper divisors (10013020977).

18538958031 is a wasteful number, since it uses less digits than its factorization.

18538958031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33046302.

The product of its (nonzero) digits is 1036800, while the sum is 51.

The spelling of 18538958031 in words is "eighteen billion, five hundred thirty-eight million, nine hundred fifty-eight thousand, thirty-one".