18131135715 has 512 divisors, whose sum is σ = 45386956800. Its totient is φ = 6638837760.

The previous prime is 18131135707. The next prime is 18131135723. The reversal of 18131135715 is 51753113181.

18131135715 is a `hidden beast` number, since 1 + 81 + 3 + 1 + 1 + 3 + 571 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (18131135707) and next prime (18131135723).

It is not a de Polignac number, because 18131135715 - 2³ = 18131135707 is a prime.

It is a super-2 number, since 2×18131135715² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18131135715.

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 511 ways as a sum of consecutive naturals, for example, 307307356 + ... + 307307414.

It is an arithmetic number, because the mean of its divisors is an integer number (88646400).

Almost surely, 2^18131135715 is an apocalyptic number.

18131135715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18131135715 is an abundant number, since it is smaller than the sum of its proper divisors (27255821085).

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

18131135715 is a wasteful number, since it uses less digits than its factorization.

18131135715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 186 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

Adding to 18131135715 its reverse (51753113181), we get a palindrome (69884248896).

The spelling of 18131135715 in words is "eighteen billion, one hundred thirty-one million, one hundred thirty-five thousand, seven hundred fifteen".