18056931893 has 32 divisors (see below), whose sum is σ = 24835652352. Its totient is φ = 12671193600.

The previous prime is 18056931883. The next prime is 18056931923. The reversal of 18056931893 is 39813965081.

It is not a de Polignac number, because 18056931893 - 2⁴ = 18056931877 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056931853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178946 + ... + 261027.

It is an arithmetic number, because the mean of its divisors is an integer number (776114136).

Almost surely, 2^18056931893 is an apocalyptic number.

18056931893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18056931893 is a deficient number, since it is larger than the sum of its proper divisors (6778720459).

18056931893 is a wasteful number, since it uses less digits than its factorization.

18056931893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440045.

The product of its (nonzero) digits is 1399680, while the sum is 53.

It can be divided in two parts, 18056 and 931893, that added together give a palindrome (949949).

The spelling of 18056931893 in words is "eighteen billion, fifty-six million, nine hundred thirty-one thousand, eight hundred ninety-three".