18368700031 has 4 divisors (see below), whose sum is σ = 20038581864. Its totient is φ = 16698818200.

The previous prime is 18368700001. The next prime is 18368700071. The reversal of 18368700031 is 13000786381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18368700031 - 2¹⁹ = 18368175743 is a prime.

It is a super-2 number, since 2×18368700031² (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 (18368700001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834940900 + ... + 834940921.

It is an arithmetic number, because the mean of its divisors is an integer number (5009645466).

Almost surely, 2^18368700031 is an apocalyptic number.

18368700031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18368700031 is a deficient number, since it is larger than the sum of its proper divisors (1669881833).

18368700031 is a wasteful number, since it uses less digits than its factorization.

18368700031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669881832.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 18368700031 in words is "eighteen billion, three hundred sixty-eight million, seven hundred thousand, thirty-one".