18038166515 has 16 divisors (see below), whose sum is σ = 22788498720. Its totient is φ = 13668963840.

The previous prime is 18038166479. The next prime is 18038166529. The reversal of 18038166515 is 51566183081.

It is a happy number.

It is not a de Polignac number, because 18038166515 - 2¹⁸ = 18037904371 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971297 + ... + 989693.

It is an arithmetic number, because the mean of its divisors is an integer number (1424281170).

Almost surely, 2^18038166515 is an apocalyptic number.

18038166515 is a deficient number, since it is larger than the sum of its proper divisors (4750332205).

18038166515 is a wasteful number, since it uses less digits than its factorization.

18038166515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28742.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 18038166515 in words is "eighteen billion, thirty-eight million, one hundred sixty-six thousand, five hundred fifteen".