12365565355566 has 80 divisors (see below), whose sum is σ = 27782022280320. Its totient is φ = 4110858092880.

The previous prime is 12365565355547. The next prime is 12365565355573. The reversal of 12365565355566 is 66555356556321.

12365565355566 is a `hidden beast` number, since 1 + 2 + 3 + 6 + 5 + 5 + 65 + 3 + 5 + 5 + 566 = 666.

12365565355566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 127775625 + ... + 127872363.

It is an arithmetic number, because the mean of its divisors is an integer number (347275278504).

Almost surely, 2^{12365565355566} is an apocalyptic number.

12365565355566 is an abundant number, since it is smaller than the sum of its proper divisors (15416456924754).

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

12365565355566 is a wasteful number, since it uses less digits than its factorization.

12365565355566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98851 (or 98842 counting only the distinct ones).

The product of its digits is 364500000, while the sum is 63.

The spelling of 12365565355566 in words is "twelve trillion, three hundred sixty-five billion, five hundred sixty-five million, three hundred fifty-five thousand, five hundred sixty-six".