18447615684 has 27 divisors (see below), whose sum is σ = 46633533037. Its totient is φ = 6148933584.

The previous prime is 18447615647. The next prime is 18447615689. The reversal of 18447615684 is 48651674481.

The square root of 18447615684 is 135822.

It is a perfect power (a square), and thus also a powerful number.

18447615684 is a `hidden beast` number, since 1 + 8 + 4 + 4 + 76 + 1 + 568 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4915412100 + 13532203584 = 70110^2 + 116328^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18447615684.

It is not an unprimeable number, because it can be changed into a prime (18447615689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 803614 + ... + 826250.

Almost surely, 2^18447615684 is an apocalyptic number.

18447615684 is the 135822-nd square number.

It is an amenable number.

18447615684 is an abundant number, since it is smaller than the sum of its proper divisors (28185917353).

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

18447615684 is an frugal number, since it uses more digits than its factorization.

18447615684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45284 (or 22642 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The spelling of 18447615684 in words is "eighteen billion, four hundred forty-seven million, six hundred fifteen thousand, six hundred eighty-four".