18738831775 has 12 divisors (see below), whose sum is σ = 23238698392. Its totient is φ = 14989422240.

The previous prime is 18738831767. The next prime is 18738831779. The reversal of 18738831775 is 57713883781.

It is not a de Polignac number, because 18738831775 - 2³ = 18738831767 is a prime.

It is a super-2 number, since 2×18738831775² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738831779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225472 + ... + 297178.

Almost surely, 2^18738831775 is an apocalyptic number.

18738831775 is a deficient number, since it is larger than the sum of its proper divisors (4499866617).

18738831775 is a wasteful number, since it uses less digits than its factorization.

18738831775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82170 (or 82165 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 58.

The spelling of 18738831775 in words is "eighteen billion, seven hundred thirty-eight million, eight hundred thirty-one thousand, seven hundred seventy-five".