18213570565696 has 63 divisors (see below), whose sum is σ = 39727758800737. Its totient is φ = 8278725002240.

The previous prime is 18213570565661. The next prime is 18213570565741. The reversal of 18213570565696 is 69656507531281.

It is a happy number.

The square root of 18213570565696 is 4267736.

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

It can be written as a sum of positive squares in only one way, i.e., 2859210446400 + 15354360119296 = 1690920^2 + 3918464^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 375536520 + ... + 375585016.

Almost surely, 2^{18213570565696} is an apocalyptic number.

18213570565696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18213570565696 is the 4267736-th square number.

It is an amenable number.

18213570565696 is an abundant number, since it is smaller than the sum of its proper divisors (21514188235041).

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

18213570565696 is an frugal number, since it uses more digits than its factorization.

18213570565696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97028 (or 48510 counting only the distinct ones).

The product of its (nonzero) digits is 81648000, while the sum is 64.

18213570565696 divided by its sum of digits (64) gives a square (284587040089 = 533467²).

The spelling of 18213570565696 in words is "eighteen trillion, two hundred thirteen billion, five hundred seventy million, five hundred sixty-five thousand, six hundred ninety-six".