18415575616 has 21 divisors (see below), whose sum is σ = 36545562291. Its totient is φ = 9207244992.

The previous prime is 18415575587. The next prime is 18415575631. The reversal of 18415575616 is 61657551481.

The square root of 18415575616 is 135704.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×18415575616² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18415575616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1077151 + ... + 1094113.

It is an arithmetic number, because the mean of its divisors is an integer number (1740264871).

Almost surely, 2^18415575616 is an apocalyptic number.

18415575616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18415575616 is the 135704-th square number.

It is an amenable number.

18415575616 is a deficient number, since it is larger than the sum of its proper divisors (18129986675).

18415575616 is an frugal number, since it uses more digits than its factorization.

18415575616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33938 (or 16965 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 49.

Multiplying 18415575616 by its sum of digits (49), we get a square (902363205184 = 949928²).

The spelling of 18415575616 in words is "eighteen billion, four hundred fifteen million, five hundred seventy-five thousand, six hundred sixteen".