11656630565 has 4 divisors (see below), whose sum is σ = 13987956684. Its totient is φ = 9325304448.

The previous prime is 11656630493. The next prime is 11656630577. The reversal of 11656630565 is 56503665611.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7177139524 + 4479491041 = 84718^2 + 66929^2 .

It is a cyclic number.

It is not a de Polignac number, because 11656630565 - 2⁸ = 11656630309 is a prime.

It is a super-2 number, since 2×11656630565² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165663052 + ... + 1165663061.

It is an arithmetic number, because the mean of its divisors is an integer number (3496989171).

Almost surely, 2^11656630565 is an apocalyptic number.

It is an amenable number.

11656630565 is a deficient number, since it is larger than the sum of its proper divisors (2331326119).

11656630565 is an equidigital number, since it uses as much as digits as its factorization.

11656630565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331326118.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 11656630565 in words is "eleven billion, six hundred fifty-six million, six hundred thirty thousand, five hundred sixty-five".