18115085217124 has 27 divisors (see below), whose sum is σ = 36877259065017. Its totient is φ = 7763582413104.

The previous prime is 18115085217107. The next prime is 18115085217221. The reversal of 18115085217124 is 42171258051181.

The square root of 18115085217124 is 4256182.

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

It can be written as a sum of positive squares in only one way, i.e., 2615368184100 + 15499717033024 = 1617210^2 + 3936968^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 59434542 + ... + 59738554.

Almost surely, 2^{18115085217124} is an apocalyptic number.

18115085217124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18115085217124 is the 4256182-nd square number.

It is an amenable number.

18115085217124 is an abundant number, since it is smaller than the sum of its proper divisors (18762173847893).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18115085217124 is an frugal number, since it uses more digits than its factorization.

18115085217124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608044 (or 304022 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 46.

The spelling of 18115085217124 in words is "eighteen trillion, one hundred fifteen billion, eighty-five million, two hundred seventeen thousand, one hundred twenty-four".