5661305917 has 2 divisors, whose sum is σ = 5661305918. Its totient is φ = 5661305916.

The previous prime is 5661305893. The next prime is 5661305921. The reversal of 5661305917 is 7195031665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5606115876 + 55190041 = 74874^2 + 7429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661305917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661305957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830652958 + 2830652959.

It is an arithmetic number, because the mean of its divisors is an integer number (2830652959).

Almost surely, 2^5661305917 is an apocalyptic number.

It is an amenable number.

5661305917 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661305917 is an equidigital number, since it uses as much as digits as its factorization.

5661305917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 5661305917 is about 75241.6501480397. The cubic root of 5661305917 is about 1782.2647095284.

The spelling of 5661305917 in words is "five billion, six hundred sixty-one million, three hundred five thousand, nine hundred seventeen".