13681775978 has 16 divisors (see below), whose sum is σ = 22270048416. Its totient is φ = 6266460720.

The previous prime is 13681775971. The next prime is 13681775993. The reversal of 13681775978 is 87957718631.

It is a self number, because there is not a number n which added to its sum of digits gives 13681775978.

It is not an unprimeable number, because it can be changed into a prime (13681775971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005076 + ... + 2011887.

It is an arithmetic number, because the mean of its divisors is an integer number (1391878026).

Almost surely, 2^13681775978 is an apocalyptic number.

13681775978 is a deficient number, since it is larger than the sum of its proper divisors (8588272438).

13681775978 is a wasteful number, since it uses less digits than its factorization.

13681775978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017109.

The product of its digits is 17781120, while the sum is 62.

The spelling of 13681775978 in words is "thirteen billion, six hundred eighty-one million, seven hundred seventy-five thousand, nine hundred seventy-eight".