18387636564 has 48 divisors (see below), whose sum is σ = 46813003776. Its totient is φ = 5571045600.

The previous prime is 18387636559. The next prime is 18387636569. The reversal of 18387636564 is 46563678381.

It is an interprime number because it is at equal distance from previous prime (18387636559) and next prime (18387636569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18387636569) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1252909 + ... + 1267499.

It is an arithmetic number, because the mean of its divisors is an integer number (975270912).

Almost surely, 2^18387636564 is an apocalyptic number.

It is an amenable number.

18387636564 is an abundant number, since it is smaller than the sum of its proper divisors (28425367212).

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

18387636564 is a wasteful number, since it uses less digits than its factorization.

18387636564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24156 (or 24154 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 57.

The spelling of 18387636564 in words is "eighteen billion, three hundred eighty-seven million, six hundred thirty-six thousand, five hundred sixty-four".