56011666661657 has 6 divisors (see below), whose sum is σ = 65156428565658. Its totient is φ = 48009999995664.

The previous prime is 56011666661651. The next prime is 56011666661677. The reversal of 56011666661657 is 75616666611065.

It can be written as a sum of positive squares in only one way, i.e., 51228102779161 + 4783563882496 = 7157381^2 + 2187136^2 .

It is not a de Polignac number, because 56011666661657 - 2²⁶ = 56011599552793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56011666661657.

It is not an unprimeable number, because it can be changed into a prime (56011666661651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 571547618948 + ... + 571547619045.

It is an arithmetic number, because the mean of its divisors is an integer number (10859404760943).

Almost surely, 2^{56011666661657} is an apocalyptic number.

It is an amenable number.

56011666661657 is a deficient number, since it is larger than the sum of its proper divisors (9144761904001).

56011666661657 is a wasteful number, since it uses less digits than its factorization.

56011666661657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143095238007 (or 1143095238000 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 62.

The spelling of 56011666661657 in words is "fifty-six trillion, eleven billion, six hundred sixty-six million, six hundred sixty-one thousand, six hundred fifty-seven".