18027661584 has 40 divisors (see below), whose sum is σ = 46597231872. Its totient is φ = 6005895040.

The previous prime is 18027661559. The next prime is 18027661591. The reversal of 18027661584 is 48516672081.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15507 + ... + 190514.

Almost surely, 2^18027661584 is an apocalyptic number.

It is an amenable number.

18027661584 is an abundant number, since it is smaller than the sum of its proper divisors (28569570288).

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

18027661584 is a wasteful number, since it uses less digits than its factorization.

18027661584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207855 (or 207849 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

It can be divided in two parts, 180276 and 61584, that added together give a triangular number (241860 = T₆₉₅).

The spelling of 18027661584 in words is "eighteen billion, twenty-seven million, six hundred sixty-one thousand, five hundred eighty-four".