56522121661 has 2 divisors, whose sum is σ = 56522121662. Its totient is φ = 56522121660.

The previous prime is 56522121637. The next prime is 56522121703. The reversal of 56522121661 is 16612122565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55728572761 + 793548900 = 236069^2 + 28170^2 .

It is a cyclic number.

It is not a de Polignac number, because 56522121661 - 2¹¹ = 56522119613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56522121661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56522121361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28261060830 + 28261060831.

It is an arithmetic number, because the mean of its divisors is an integer number (28261060831).

Almost surely, 2^56522121661 is an apocalyptic number.

It is an amenable number.

56522121661 is a deficient number, since it is larger than the sum of its proper divisors (1).

56522121661 is an equidigital number, since it uses as much as digits as its factorization.

56522121661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The spelling of 56522121661 in words is "fifty-six billion, five hundred twenty-two million, one hundred twenty-one thousand, six hundred sixty-one".