13691366778 has 16 divisors (see below), whose sum is σ = 27491831136. Its totient is φ = 4545606000.

The previous prime is 13691366761. The next prime is 13691366803. The reversal of 13691366778 is 87766319631.

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, 4544101 + ... + 4547112.

It is an arithmetic number, because the mean of its divisors is an integer number (1718239446).

Almost surely, 2^13691366778 is an apocalyptic number.

13691366778 is an abundant number, since it is smaller than the sum of its proper divisors (13800464358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13691366778 is a wasteful number, since it uses less digits than its factorization.

13691366778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9091469.

The product of its digits is 6858432, while the sum is 57.

The spelling of 13691366778 in words is "thirteen billion, six hundred ninety-one million, three hundred sixty-six thousand, seven hundred seventy-eight".