11655656661 has 48 divisors (see below), whose sum is σ = 17255952000. Its totient is φ = 6992599680.

The previous prime is 11655656657. The next prime is 11655656687. The reversal of 11655656661 is 16665655611.

It is not a de Polignac number, because 11655656661 - 2² = 11655656657 is a prime.

It is a super-2 number, since 2×11655656661² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11655656661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11655656651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22898875 + ... + 22899383.

It is an arithmetic number, because the mean of its divisors is an integer number (359499000).

Almost surely, 2^11655656661 is an apocalyptic number.

11655656661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11655656661 is a deficient number, since it is larger than the sum of its proper divisors (5600295339).

11655656661 is a wasteful number, since it uses less digits than its factorization.

11655656661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1039 counting only the distinct ones).

The product of its digits is 972000, while the sum is 48.

The spelling of 11655656661 in words is "eleven billion, six hundred fifty-five million, six hundred fifty-six thousand, six hundred sixty-one".