13565253666 has 24 divisors (see below), whose sum is σ = 28820300400. Its totient is φ = 4255765312.

The previous prime is 13565253641. The next prime is 13565253707. The reversal of 13565253666 is 66635256531.

It is a super-2 number, since 2×13565253666² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3909816 + ... + 3913283.

It is an arithmetic number, because the mean of its divisors is an integer number (1200845850).

Almost surely, 2^13565253666 is an apocalyptic number.

13565253666 is an abundant number, since it is smaller than the sum of its proper divisors (15255046734).

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

13565253666 is a wasteful number, since it uses less digits than its factorization.

13565253666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7823138 (or 7823121 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 48.

The spelling of 13565253666 in words is "thirteen billion, five hundred sixty-five million, two hundred fifty-three thousand, six hundred sixty-six".