13981977085 has 4 divisors (see below), whose sum is σ = 16778372508. Its totient is φ = 11185581664.

The previous prime is 13981977077. The next prime is 13981977157. The reversal of 13981977085 is 58077918931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10897063321 + 3084913764 = 104389^2 + 55542^2 .

It is a cyclic number.

It is not a de Polignac number, because 13981977085 - 2³ = 13981977077 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1398197704 + ... + 1398197713.

It is an arithmetic number, because the mean of its divisors is an integer number (4194593127).

Almost surely, 2^13981977085 is an apocalyptic number.

It is an amenable number.

13981977085 is a deficient number, since it is larger than the sum of its proper divisors (2796395423).

13981977085 is an equidigital number, since it uses as much as digits as its factorization.

13981977085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796395422.

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 13981977085 in words is "thirteen billion, nine hundred eighty-one million, nine hundred seventy-seven thousand, eighty-five".