11661637479 has 4 divisors (see below), whose sum is σ = 15548849976. Its totient is φ = 7774424984.

The previous prime is 11661637469. The next prime is 11661637483. The reversal of 11661637479 is 97473616611.

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

It is a cyclic number.

It is not a de Polignac number, because 11661637479 - 2⁵ = 11661637447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661637439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943606244 + ... + 1943606249.

It is an arithmetic number, because the mean of its divisors is an integer number (3887212494).

Almost surely, 2^11661637479 is an apocalyptic number.

11661637479 is a deficient number, since it is larger than the sum of its proper divisors (3887212497).

11661637479 is an equidigital number, since it uses as much as digits as its factorization.

11661637479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887212496.

The product of its digits is 1143072, while the sum is 51.

The spelling of 11661637479 in words is "eleven billion, six hundred sixty-one million, six hundred thirty-seven thousand, four hundred seventy-nine".