18387590081 has 32 divisors (see below), whose sum is σ = 22542750720. Its totient is φ = 14648040000.

The previous prime is 18387590059. The next prime is 18387590107. The reversal of 18387590081 is 18009578381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18387590081 is a prime.

It is a super-2 number, since 2×18387590081² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18387592081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2232551 + ... + 2240771.

It is an arithmetic number, because the mean of its divisors is an integer number (704460960).

Almost surely, 2^18387590081 is an apocalyptic number.

It is an amenable number.

18387590081 is a deficient number, since it is larger than the sum of its proper divisors (4155160639).

18387590081 is a wasteful number, since it uses less digits than its factorization.

18387590081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8565.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 18387590081 in words is "eighteen billion, three hundred eighty-seven million, five hundred ninety thousand, eighty-one".