318162892561 has 2 divisors, whose sum is σ = 318162892562. Its totient is φ = 318162892560.

The previous prime is 318162892559. The next prime is 318162892603. The reversal of 318162892561 is 165298261813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317820827536 + 342065025 = 563756^2 + 18495^2 .

It is a cyclic number.

It is not a de Polignac number, because 318162892561 - 2¹ = 318162892559 is a prime.

Together with 318162892559, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 318162892499 and 318162892508.

It is not a weakly prime, because it can be changed into another prime (318162892501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159081446280 + 159081446281.

It is an arithmetic number, because the mean of its divisors is an integer number (159081446281).

Almost surely, 2^318162892561 is an apocalyptic number.

It is an amenable number.

318162892561 is a deficient number, since it is larger than the sum of its proper divisors (1).

318162892561 is an equidigital number, since it uses as much as digits as its factorization.

318162892561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 52.

The spelling of 318162892561 in words is "three hundred eighteen billion, one hundred sixty-two million, eight hundred ninety-two thousand, five hundred sixty-one".