18507086403 has 16 divisors (see below), whose sum is σ = 26731531680. Its totient is φ = 11388972192.

The previous prime is 18507086393. The next prime is 18507086441. The reversal of 18507086403 is 30468070581.

It is not a de Polignac number, because 18507086403 - 2²² = 18502892099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18507086503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1397376 + ... + 1410557.

It is an arithmetic number, because the mean of its divisors is an integer number (1670720730).

Almost surely, 2^18507086403 is an apocalyptic number.

18507086403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18507086403 is a deficient number, since it is larger than the sum of its proper divisors (8224445277).

18507086403 is an equidigital number, since it uses as much as digits as its factorization.

18507086403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807975 (or 2807949 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 18507086403 in words is "eighteen billion, five hundred seven million, eighty-six thousand, four hundred three".