11579637661 has 16 divisors (see below), whose sum is σ = 12179692800. Its totient is φ = 10987827840.

The previous prime is 11579637653. The next prime is 11579637673. The reversal of 11579637661 is 16673697511.

It is a cyclic number.

It is not a de Polignac number, because 11579637661 - 2³ = 11579637653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11579637599 and 11579637608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11579637061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3538456 + ... + 3541726.

It is an arithmetic number, because the mean of its divisors is an integer number (761230800).

Almost surely, 2^11579637661 is an apocalyptic number.

It is an amenable number.

11579637661 is a deficient number, since it is larger than the sum of its proper divisors (600055139).

11579637661 is a wasteful number, since it uses less digits than its factorization.

11579637661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476.

The product of its digits is 1428840, while the sum is 52.

It can be divided in two parts, 115 and 79637661, that added together give a square (79637776 = 8924²).

The spelling of 11579637661 in words is "eleven billion, five hundred seventy-nine million, six hundred thirty-seven thousand, six hundred sixty-one".