18430399185 has 16 divisors (see below), whose sum is σ = 32169424320. Its totient is φ = 8935951040.

The previous prime is 18430399139. The next prime is 18430399231. The reversal of 18430399185 is 58199303481.

It is an interprime number because it is at equal distance from previous prime (18430399139) and next prime (18430399231).

It is not a de Polignac number, because 18430399185 - 2⁸ = 18430398929 is a prime.

It is a super-2 number, since 2×18430399185² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55849530 + ... + 55849859.

It is an arithmetic number, because the mean of its divisors is an integer number (2010589020).

Almost surely, 2^18430399185 is an apocalyptic number.

18430399185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18430399185 is a deficient number, since it is larger than the sum of its proper divisors (13739025135).

18430399185 is a wasteful number, since it uses less digits than its factorization.

18430399185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111699408.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 18430399185 in words is "eighteen billion, four hundred thirty million, three hundred ninety-nine thousand, one hundred eighty-five".