11813977691 has 8 divisors (see below), whose sum is σ = 11893089600. Its totient is φ = 11735113600.

The previous prime is 11813977663. The next prime is 11813977717. The reversal of 11813977691 is 19677931811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11813977691 - 2¹⁴ = 11813961307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11813970691) 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, 34205 + ... + 157473.

It is an arithmetic number, because the mean of its divisors is an integer number (1486636200).

Almost surely, 2^11813977691 is an apocalyptic number.

11813977691 is a deficient number, since it is larger than the sum of its proper divisors (79111909).

11813977691 is a wasteful number, since it uses less digits than its factorization.

11813977691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123909.

The product of its digits is 571536, while the sum is 53.

The spelling of 11813977691 in words is "eleven billion, eight hundred thirteen million, nine hundred seventy-seven thousand, six hundred ninety-one".