318158348657 has 4 divisors (see below), whose sum is σ = 318936242340. Its totient is φ = 317380454976.

The previous prime is 318158348653. The next prime is 318158348701. The reversal of 318158348657 is 756843851813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756843851813 = 7 ⋅108120550259.

It can be written as a sum of positive squares in 2 ways, for example, as 271937218576 + 46221130081 = 521476^2 + 214991^2 .

It is a cyclic number.

It is not a de Polignac number, because 318158348657 - 2² = 318158348653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 318158348596 and 318158348605.

It is not an unprimeable number, because it can be changed into a prime (318158348653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388946228 + ... + 388947045.

It is an arithmetic number, because the mean of its divisors is an integer number (79734060585).

Almost surely, 2^318158348657 is an apocalyptic number.

It is an amenable number.

318158348657 is a deficient number, since it is larger than the sum of its proper divisors (777893683).

318158348657 is an equidigital number, since it uses as much as digits as its factorization.

318158348657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777893682.

The product of its digits is 19353600, while the sum is 59.

The spelling of 318158348657 in words is "three hundred eighteen billion, one hundred fifty-eight million, three hundred forty-eight thousand, six hundred fifty-seven".