318845661661 has 2 divisors, whose sum is σ = 318845661662. Its totient is φ = 318845661660.

The previous prime is 318845661649. The next prime is 318845661707. The reversal of 318845661661 is 166166548813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317722741561 + 1122920100 = 563669^2 + 33510^2 .

It is a cyclic number.

It is not a de Polignac number, because 318845661661 - 2⁹ = 318845661149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318845661611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159422830830 + 159422830831.

It is an arithmetic number, because the mean of its divisors is an integer number (159422830831).

Almost surely, 2^318845661661 is an apocalyptic number.

It is an amenable number.

318845661661 is a deficient number, since it is larger than the sum of its proper divisors (1).

318845661661 is an equidigital number, since it uses as much as digits as its factorization.

318845661661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 55.

The spelling of 318845661661 in words is "three hundred eighteen billion, eight hundred forty-five million, six hundred sixty-one thousand, six hundred sixty-one".