13688444777 has 4 divisors (see below), whose sum is σ = 15643936896. Its totient is φ = 11732952660.

The previous prime is 13688444741. The next prime is 13688444843. The reversal of 13688444777 is 77744488631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13688444777 - 2¹⁶ = 13688379241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13688444677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977746049 + ... + 977746062.

It is an arithmetic number, because the mean of its divisors is an integer number (3910984224).

Almost surely, 2^13688444777 is an apocalyptic number.

It is an amenable number.

13688444777 is a deficient number, since it is larger than the sum of its proper divisors (1955492119).

13688444777 is an equidigital number, since it uses as much as digits as its factorization.

13688444777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955492118.

The product of its digits is 25288704, while the sum is 59.

The spelling of 13688444777 in words is "thirteen billion, six hundred eighty-eight million, four hundred forty-four thousand, seven hundred seventy-seven".