18809447564196 has 81 divisors (see below), whose sum is σ = 47728277474241. Its totient is φ = 6245884365984.

The previous prime is 18809447564191. The next prime is 18809447564213. The reversal of 18809447564196 is 69146574490881.

The square root of 18809447564196 is 4336986.

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

18809447564196 is a `hidden beast` number, since 1 + 8 + 8 + 0 + 9 + 4 + 47 + 564 + 19 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17796332844900 + 1013114719296 = 4218570^2 + 1006536^2 .

It is a super-2 number, since 2×18809447564196² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18809447564191) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7624420155 + ... + 7624422621.

Almost surely, 2^{18809447564196} is an apocalyptic number.

18809447564196 is the 4336986-th square number.

It is an amenable number.

18809447564196 is an abundant number, since it is smaller than the sum of its proper divisors (28918829910045).

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

18809447564196 is an frugal number, since it uses more digits than its factorization.

18809447564196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 72.

The spelling of 18809447564196 in words is "eighteen trillion, eight hundred nine billion, four hundred forty-seven million, five hundred sixty-four thousand, one hundred ninety-six".