18745975531 has 16 divisors (see below), whose sum is σ = 20065260384. Its totient is φ = 17451270144.

The previous prime is 18745975513. The next prime is 18745975601. The reversal of 18745975531 is 13557954781.

It is a cyclic number.

It is not a de Polignac number, because 18745975531 - 2⁷ = 18745975403 is a prime.

It is a super-2 number, since 2×18745975531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745976531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216531 + ... + 1231843.

It is an arithmetic number, because the mean of its divisors is an integer number (1254078774).

Almost surely, 2^18745975531 is an apocalyptic number.

18745975531 is a deficient number, since it is larger than the sum of its proper divisors (1319284853).

18745975531 is a wasteful number, since it uses less digits than its factorization.

18745975531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16110.

The product of its digits is 5292000, while the sum is 55.

The spelling of 18745975531 in words is "eighteen billion, seven hundred forty-five million, nine hundred seventy-five thousand, five hundred thirty-one".