561185663 has 2 divisors, whose sum is σ = 561185664. Its totient is φ = 561185662.

The previous prime is 561185621. The next prime is 561185683. The reversal of 561185663 is 366581165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561185663 - 2⁸ = 561185407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561185663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561185683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280592831 + 280592832.

It is an arithmetic number, because the mean of its divisors is an integer number (280592832).

Almost surely, 2^561185663 is an apocalyptic number.

561185663 is a deficient number, since it is larger than the sum of its proper divisors (1).

561185663 is an equidigital number, since it uses as much as digits as its factorization.

561185663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 561185663 is about 23689.3575894324. The cubic root of 561185663 is about 824.8383707853.

The spelling of 561185663 in words is "five hundred sixty-one million, one hundred eighty-five thousand, six hundred sixty-three".