13766639865 has 64 divisors (see below), whose sum is σ = 25694952192. Its totient is φ = 6219776000.

The previous prime is 13766639771. The next prime is 13766639891. The reversal of 13766639865 is 56893666731.

It is not a de Polignac number, because 13766639865 - 2⁸ = 13766639609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13766639799 and 13766639808.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 259009 + ... + 307601.

It is an arithmetic number, because the mean of its divisors is an integer number (401483628).

Almost surely, 2^13766639865 is an apocalyptic number.

13766639865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13766639865 is a deficient number, since it is larger than the sum of its proper divisors (11928312327).

13766639865 is a wasteful number, since it uses less digits than its factorization.

13766639865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48730.

The product of its digits is 29393280, while the sum is 60.

The spelling of 13766639865 in words is "thirteen billion, seven hundred sixty-six million, six hundred thirty-nine thousand, eight hundred sixty-five".