11656620869 has 4 divisors (see below), whose sum is σ = 12163430496. Its totient is φ = 11149811244.

The previous prime is 11656620851. The next prime is 11656620887. The reversal of 11656620869 is 96802665611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96802665611 = 76441 ⋅1266371.

It is an interprime number because it is at equal distance from previous prime (11656620851) and next prime (11656620887).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11656620869 is a prime.

It is a super-2 number, since 2×11656620869² (a number of 21 digits) contains 22 as substring.

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 (11656650869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253404779 + ... + 253404824.

It is an arithmetic number, because the mean of its divisors is an integer number (3040857624).

Almost surely, 2^11656620869 is an apocalyptic number.

It is an amenable number.

11656620869 is a deficient number, since it is larger than the sum of its proper divisors (506809627).

11656620869 is an equidigital number, since it uses as much as digits as its factorization.

11656620869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506809626.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 11656620869 in words is "eleven billion, six hundred fifty-six million, six hundred twenty thousand, eight hundred sixty-nine".