5656561557 has 24 divisors (see below), whose sum is σ = 7894238688. Its totient is φ = 3602517600.

The previous prime is 5656561541. The next prime is 5656561607. The reversal of 5656561557 is 7551656565.

It is not a de Polignac number, because 5656561557 - 2⁴ = 5656561541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656561357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1618582 + ... + 1622072.

It is an arithmetic number, because the mean of its divisors is an integer number (328926612).

Almost surely, 2^5656561557 is an apocalyptic number.

It is an amenable number.

5656561557 is a deficient number, since it is larger than the sum of its proper divisors (2237677131).

5656561557 is a wasteful number, since it uses less digits than its factorization.

5656561557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561 (or 4538 counting only the distinct ones).

The product of its digits is 4725000, while the sum is 51.

The square root of 5656561557 is about 75210.1160549563. The cubic root of 5656561557 is about 1781.7667049646.

The spelling of 5656561557 in words is "five billion, six hundred fifty-six million, five hundred sixty-one thousand, five hundred fifty-seven".