616661317 has 2 divisors, whose sum is σ = 616661318. Its totient is φ = 616661316.

The previous prime is 616661239. The next prime is 616661329. The reversal of 616661317 is 713166616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466819236 + 149842081 = 21606^2 + 12241^2 .

It is a cyclic number.

It is not a de Polignac number, because 616661317 - 2⁷ = 616661189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616661377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308330658 + 308330659.

It is an arithmetic number, because the mean of its divisors is an integer number (308330659).

Almost surely, 2^616661317 is an apocalyptic number.

It is an amenable number.

616661317 is a deficient number, since it is larger than the sum of its proper divisors (1).

616661317 is an equidigital number, since it uses as much as digits as its factorization.

616661317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 616661317 is about 24832.6663288500. Note that the first 3 decimals coincide. The cubic root of 616661317 is about 851.1685505664.

The spelling of 616661317 in words is "six hundred sixteen million, six hundred sixty-one thousand, three hundred seventeen".