18109730331 has 64 divisors (see below), whose sum is σ = 33486812160. Its totient is φ = 9397140480.

The previous prime is 18109730329. The next prime is 18109730351. The reversal of 18109730331 is 13303790181.

It is not a de Polignac number, because 18109730331 - 2¹ = 18109730329 is a prime.

It is a super-2 number, since 2×18109730331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18109730351) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2068395 + ... + 2077131.

It is an arithmetic number, because the mean of its divisors is an integer number (523231440).

Almost surely, 2^18109730331 is an apocalyptic number.

18109730331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18109730331 is a deficient number, since it is larger than the sum of its proper divisors (15377081829).

18109730331 is a wasteful number, since it uses less digits than its factorization.

18109730331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9761 (or 9755 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The spelling of 18109730331 in words is "eighteen billion, one hundred nine million, seven hundred thirty thousand, three hundred thirty-one".