18515087538872 has 32 divisors (see below), whose sum is σ = 35235396446400. Its totient is φ = 9119749478400.

The previous prime is 18515087538853. The next prime is 18515087538889. The reversal of 18515087538872 is 27883578051581.

It is a super-2 number, since 2×18515087538872² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 47785529 + ... + 48171432.

It is an arithmetic number, because the mean of its divisors is an integer number (1101106138950).

Almost surely, 2^{18515087538872} is an apocalyptic number.

It is an amenable number.

18515087538872 is a deficient number, since it is larger than the sum of its proper divisors (16720308907528).

18515087538872 is a wasteful number, since it uses less digits than its factorization.

18515087538872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95957327 (or 95957323 counting only the distinct ones).

The product of its (nonzero) digits is 150528000, while the sum is 68.

The spelling of 18515087538872 in words is "eighteen trillion, five hundred fifteen billion, eighty-seven million, five hundred thirty-eight thousand, eight hundred seventy-two".