18261877815012 has 96 divisors (see below), whose sum is σ = 48306812037120. Its totient is φ = 5322992976000.

The previous prime is 18261877814959. The next prime is 18261877815017. The reversal of 18261877815012 is 21051877816281.

It is a super-3 number, since 3×18261877815012³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (18261877815017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53927173 + ... + 54264755.

It is an arithmetic number, because the mean of its divisors is an integer number (503195958720).

Almost surely, 2^{18261877815012} is an apocalyptic number.

18261877815012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18261877815012 is an abundant number, since it is smaller than the sum of its proper divisors (30044934222108).

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

18261877815012 is a wasteful number, since it uses less digits than its factorization.

18261877815012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355873 (or 355871 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 57.

The spelling of 18261877815012 in words is "eighteen trillion, two hundred sixty-one billion, eight hundred seventy-seven million, eight hundred fifteen thousand, twelve".