5661258217 has 2 divisors, whose sum is σ = 5661258218. Its totient is φ = 5661258216.

The previous prime is 5661258193. The next prime is 5661258233. The reversal of 5661258217 is 7128521665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3506534656 + 2154723561 = 59216^2 + 46419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661258217 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661258517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830629108 + 2830629109.

It is an arithmetic number, because the mean of its divisors is an integer number (2830629109).

Almost surely, 2^5661258217 is an apocalyptic number.

It is an amenable number.

5661258217 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661258217 is an equidigital number, since it uses as much as digits as its factorization.

5661258217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 5661258217 is about 75241.3331686780. Note that the first 3 decimals coincide. The cubic root of 5661258217 is about 1782.2597039539.

The spelling of 5661258217 in words is "five billion, six hundred sixty-one million, two hundred fifty-eight thousand, two hundred seventeen".