318702815617 has 2 divisors, whose sum is σ = 318702815618. Its totient is φ = 318702815616.

The previous prime is 318702815551. The next prime is 318702815647. The reversal of 318702815617 is 716518207813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225692455041 + 93010360576 = 475071^2 + 304976^2 .

It is a cyclic number.

It is not a de Polignac number, because 318702815617 - 2²⁷ = 318568597889 is a prime.

It is not a weakly prime, because it can be changed into another prime (318702815647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159351407808 + 159351407809.

It is an arithmetic number, because the mean of its divisors is an integer number (159351407809).

Almost surely, 2^318702815617 is an apocalyptic number.

It is an amenable number.

318702815617 is a deficient number, since it is larger than the sum of its proper divisors (1).

318702815617 is an equidigital number, since it uses as much as digits as its factorization.

318702815617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 318702815617 in words is "three hundred eighteen billion, seven hundred two million, eight hundred fifteen thousand, six hundred seventeen".