11681144661 has 8 divisors (see below), whose sum is σ = 15937065760. Its totient is φ = 7606326672.

The previous prime is 11681144623. The next prime is 11681144701. The reversal of 11681144661 is 16644118611.

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

It is not a de Polignac number, because 11681144661 - 2⁹ = 11681144149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681144611) 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, 45275626 + ... + 45275883.

It is an arithmetic number, because the mean of its divisors is an integer number (1992133220).

Almost surely, 2^11681144661 is an apocalyptic number.

It is an amenable number.

11681144661 is a deficient number, since it is larger than the sum of its proper divisors (4255921099).

11681144661 is an equidigital number, since it uses as much as digits as its factorization.

11681144661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90551555.

The product of its digits is 27648, while the sum is 39.

The spelling of 11681144661 in words is "eleven billion, six hundred eighty-one million, one hundred forty-four thousand, six hundred sixty-one".