18331409138 has 16 divisors (see below), whose sum is σ = 31730375040. Its totient is φ = 7780042656.

The previous prime is 18331409123. The next prime is 18331409141. The reversal of 18331409138 is 83190413381.

It is a junction number, because it is equal to n+sod(n) for n = 18331409095 and 18331409104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6354803 + ... + 6357686.

It is an arithmetic number, because the mean of its divisors is an integer number (1983148440).

Almost surely, 2^18331409138 is an apocalyptic number.

18331409138 is a deficient number, since it is larger than the sum of its proper divisors (13398965902).

18331409138 is a wasteful number, since it uses less digits than its factorization.

18331409138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12712601.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 18331409138 in words is "eighteen billion, three hundred thirty-one million, four hundred nine thousand, one hundred thirty-eight".