11656620015661 has 16 divisors (see below), whose sum is σ = 12348022579200. Its totient is φ = 10965853986048.

The previous prime is 11656620015643. The next prime is 11656620015727. The reversal of 11656620015661 is 16651002665611.

It is a cyclic number.

It is not a de Polignac number, because 11656620015661 - 2⁹ = 11656620015149 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 (11656620915661) 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, 602929351 + ... + 602948683.

It is an arithmetic number, because the mean of its divisors is an integer number (771751411200).

Almost surely, 2^{11656620015661} is an apocalyptic number.

It is an amenable number.

11656620015661 is a deficient number, since it is larger than the sum of its proper divisors (691402563539).

11656620015661 is a wasteful number, since it uses less digits than its factorization.

11656620015661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33948.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 11656620015661 in words is "eleven trillion, six hundred fifty-six billion, six hundred twenty million, fifteen thousand, six hundred sixty-one".