561116637 has 12 divisors (see below), whose sum is σ = 858178620. Its totient is φ = 352073088.

The previous prime is 561116627. The next prime is 561116651. The reversal of 561116637 is 736611165.

561116637 is a `hidden beast` number, since 5 + 6 + 1 + 1 + 16 + 637 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 484484121 + 76632516 = 22011^2 + 8754^2 .

It is not a de Polignac number, because 561116637 - 2¹⁵ = 561083869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561116627) 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, 1833562 + ... + 1833867.

It is an arithmetic number, because the mean of its divisors is an integer number (71514885).

Almost surely, 2^561116637 is an apocalyptic number.

It is an amenable number.

561116637 is a deficient number, since it is larger than the sum of its proper divisors (297061983).

561116637 is a wasteful number, since it uses less digits than its factorization.

561116637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667452 (or 3667449 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 561116637 is about 23687.9006456883. The cubic root of 561116637 is about 824.8045509454.

The spelling of 561116637 in words is "five hundred sixty-one million, one hundred sixteen thousand, six hundred thirty-seven".