11313565661 has 24 divisors (see below), whose sum is σ = 11986924032. Its totient is φ = 10672754400.

The previous prime is 11313565643. The next prime is 11313565687. The reversal of 11313565661 is 16656531311.

It is not a de Polignac number, because 11313565661 - 2¹⁴ = 11313549277 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11313561661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20912051 + ... + 20912591.

It is an arithmetic number, because the mean of its divisors is an integer number (499455168).

Almost surely, 2^11313565661 is an apocalyptic number.

It is an amenable number.

11313565661 is a deficient number, since it is larger than the sum of its proper divisors (673358371).

11313565661 is an equidigital number, since it uses as much as digits as its factorization.

11313565661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1082 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The spelling of 11313565661 in words is "eleven billion, three hundred thirteen million, five hundred sixty-five thousand, six hundred sixty-one".