13691247778 has 16 divisors (see below), whose sum is σ = 22120459200. Its totient is φ = 6317943696.

The previous prime is 13691247769. The next prime is 13691247803. The reversal of 13691247778 is 87774219631.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118701 + ... + 203647.

It is an arithmetic number, because the mean of its divisors is an integer number (1382528700).

Almost surely, 2^13691247778 is an apocalyptic number.

13691247778 is a deficient number, since it is larger than the sum of its proper divisors (8429211422).

13691247778 is a wasteful number, since it uses less digits than its factorization.

13691247778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91161.

The product of its digits is 3556224, while the sum is 55.

The spelling of 13691247778 in words is "thirteen billion, six hundred ninety-one million, two hundred forty-seven thousand, seven hundred seventy-eight".