5656662661 has 16 divisors (see below), whose sum is σ = 6199256448. Its totient is φ = 5130216000.

The previous prime is 5656662647. The next prime is 5656662709. The reversal of 5656662661 is 1662666565.

It is not a de Polignac number, because 5656662661 - 2⁵ = 5656662629 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 (5656662611) 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, 155560 + ... + 188446.

It is an arithmetic number, because the mean of its divisors is an integer number (387453528).

Almost surely, 2^5656662661 is an apocalyptic number.

It is an amenable number.

5656662661 is a deficient number, since it is larger than the sum of its proper divisors (542593787).

5656662661 is a wasteful number, since it uses less digits than its factorization.

5656662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33132.

The product of its digits is 2332800, while the sum is 49.

The square root of 5656662661 is about 75210.7881955774. The cubic root of 5656662661 is about 1781.7773205224. Note that the first 3 decimals are identical.

The spelling of 5656662661 in words is "five billion, six hundred fifty-six million, six hundred sixty-two thousand, six hundred sixty-one".