5656505661 has 12 divisors (see below), whose sum is σ = 8304451740. Its totient is φ = 3709183680.

The previous prime is 5656505641. The next prime is 5656505677. The reversal of 5656505661 is 1665056565.

It can be written as a sum of positive squares in 2 ways, for example, as 1060479225 + 4596026436 = 32565^2 + 67794^2 .

It is not a de Polignac number, because 5656505661 - 2¹¹ = 5656503613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656505611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5151096 + ... + 5152193.

It is an arithmetic number, because the mean of its divisors is an integer number (692037645).

Almost surely, 2^5656505661 is an apocalyptic number.

It is an amenable number.

5656505661 is a deficient number, since it is larger than the sum of its proper divisors (2647946079).

5656505661 is a wasteful number, since it uses less digits than its factorization.

5656505661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10303356 (or 10303353 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 5656505661 is about 75209.7444550904. The cubic root of 5656505661 is about 1781.7608360306.

The spelling of 5656505661 in words is "five billion, six hundred fifty-six million, five hundred five thousand, six hundred sixty-one".