11664556613 has 16 divisors (see below), whose sum is σ = 12461323824. Its totient is φ = 10880348160.

The previous prime is 11664556609. The next prime is 11664556691. The reversal of 11664556613 is 31665546611.

It can be written as a sum of positive squares in 8 ways, for example, as 124609 + 11664432004 = 353^2 + 108002^2 .

It is not a de Polignac number, because 11664556613 - 2² = 11664556609 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 (11664550613) 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, 1535681 + ... + 1543257.

It is an arithmetic number, because the mean of its divisors is an integer number (778832739).

Almost surely, 2^11664556613 is an apocalyptic number.

It is an amenable number.

11664556613 is a deficient number, since it is larger than the sum of its proper divisors (796767211).

11664556613 is a wasteful number, since it uses less digits than its factorization.

11664556613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8392.

The product of its digits is 388800, while the sum is 44.

The spelling of 11664556613 in words is "eleven billion, six hundred sixty-four million, five hundred fifty-six thousand, six hundred thirteen".