13765377665 has 16 divisors (see below), whose sum is σ = 17908506000. Its totient is φ = 10096972032.

The previous prime is 13765377643. The next prime is 13765377667. The reversal of 13765377665 is 56677356731.

It can be written as a sum of positive squares in 8 ways, for example, as 2641034881 + 11124342784 = 51391^2 + 105472^2 .

It is a cyclic number.

It is not a de Polignac number, because 13765377665 - 2²² = 13761183361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13765377665.

It is not an unprimeable number, because it can be changed into a prime (13765377667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700970 + ... + 720339.

It is an arithmetic number, because the mean of its divisors is an integer number (1119281625).

Almost surely, 2^13765377665 is an apocalyptic number.

It is an amenable number.

13765377665 is a deficient number, since it is larger than the sum of its proper divisors (4143128335).

13765377665 is a wasteful number, since it uses less digits than its factorization.

13765377665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421476.

The product of its digits is 16669800, while the sum is 56.

The spelling of 13765377665 in words is "thirteen billion, seven hundred sixty-five million, three hundred seventy-seven thousand, six hundred sixty-five".