561115657 has 12 divisors (see below), whose sum is σ = 604820736. Its totient is φ = 520257240.

The previous prime is 561115631. The next prime is 561115663. The reversal of 561115657 is 756511165.

It is a de Polignac number, because none of the positive numbers 2^k-561115657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561115697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432 + ... + 33502.

It is an arithmetic number, because the mean of its divisors is an integer number (50401728).

Almost surely, 2^561115657 is an apocalyptic number.

It is an amenable number.

561115657 is a deficient number, since it is larger than the sum of its proper divisors (43705079).

561115657 is a wasteful number, since it uses less digits than its factorization.

561115657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33156 (or 33137 counting only the distinct ones).

The product of its digits is 31500, while the sum is 37.

The square root of 561115657 is about 23687.8799600133. The cubic root of 561115657 is about 824.8040707666.

The spelling of 561115657 in words is "five hundred sixty-one million, one hundred fifteen thousand, six hundred fifty-seven".