18852721515656 has 96 divisors (see below), whose sum is σ = 45173548401600. Its totient is φ = 7204224291840.

The previous prime is 18852721515647. The next prime is 18852721515659. The reversal of 18852721515656 is 65651512725881.

It is a super-2 number, since 2×18852721515656² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18852721515659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30347735 + ... + 30962726.

It is an arithmetic number, because the mean of its divisors is an integer number (470557795850).

Almost surely, 2^{18852721515656} is an apocalyptic number.

It is an amenable number.

18852721515656 is an abundant number, since it is smaller than the sum of its proper divisors (26320826885944).

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

18852721515656 is a wasteful number, since it uses less digits than its factorization.

18852721515656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61310527 (or 61310506 counting only the distinct ones).

The product of its digits is 40320000, while the sum is 62.

The spelling of 18852721515656 in words is "eighteen trillion, eight hundred fifty-two billion, seven hundred twenty-one million, five hundred fifteen thousand, six hundred fifty-six".