318648013609 has 2 divisors, whose sum is σ = 318648013610. Its totient is φ = 318648013608.

The previous prime is 318648013589. The next prime is 318648013613. The reversal of 318648013609 is 906310846813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318543973609 + 104040000 = 564397^2 + 10200^2 .

It is a cyclic number.

It is not a de Polignac number, because 318648013609 - 2¹⁷ = 318647882537 is a prime.

It is a super-2 number, since 2×318648013609² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318648013639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159324006804 + 159324006805.

It is an arithmetic number, because the mean of its divisors is an integer number (159324006805).

Almost surely, 2^318648013609 is an apocalyptic number.

It is an amenable number.

318648013609 is a deficient number, since it is larger than the sum of its proper divisors (1).

318648013609 is an equidigital number, since it uses as much as digits as its factorization.

318648013609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 318648013609 in words is "three hundred eighteen billion, six hundred forty-eight million, thirteen thousand, six hundred nine".