13865945566 has 16 divisors (see below), whose sum is σ = 23472134640. Its totient is φ = 6085367680.

The previous prime is 13865945519. The next prime is 13865945567. The reversal of 13865945566 is 66554956831.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 13865945566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13865945567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10866091 + ... + 10867366.

It is an arithmetic number, because the mean of its divisors is an integer number (1467008415).

Almost surely, 2^13865945566 is an apocalyptic number.

13865945566 is a deficient number, since it is larger than the sum of its proper divisors (9606189074).

13865945566 is a wasteful number, since it uses less digits than its factorization.

13865945566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21733499.

The product of its digits is 23328000, while the sum is 58.

The spelling of 13865945566 in words is "thirteen billion, eight hundred sixty-five million, nine hundred forty-five thousand, five hundred sixty-six".