318646308161 has 4 divisors (see below), whose sum is σ = 318654316500. Its totient is φ = 318638299824.

The previous prime is 318646308139. The next prime is 318646308173. The reversal of 318646308161 is 161803646813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204716431936 + 113929876225 = 452456^2 + 337535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318646308161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318646308361) 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, 3944186 + ... + 4024163.

It is an arithmetic number, because the mean of its divisors is an integer number (79663579125).

Almost surely, 2^318646308161 is an apocalyptic number.

It is an amenable number.

318646308161 is a deficient number, since it is larger than the sum of its proper divisors (8008339).

318646308161 is an equidigital number, since it uses as much as digits as its factorization.

318646308161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008338.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 318646308161 in words is "three hundred eighteen billion, six hundred forty-six million, three hundred eight thousand, one hundred sixty-one".