318875472661 has 2 divisors, whose sum is σ = 318875472662. Its totient is φ = 318875472660.

The previous prime is 318875472623. The next prime is 318875472689. The reversal of 318875472661 is 166274578813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240310746225 + 78564726436 = 490215^2 + 280294^2 .

It is a cyclic number.

It is not a de Polignac number, because 318875472661 - 2¹⁹ = 318874948373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 318875472596 and 318875472605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318875472061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159437736330 + 159437736331.

It is an arithmetic number, because the mean of its divisors is an integer number (159437736331).

Almost surely, 2^318875472661 is an apocalyptic number.

It is an amenable number.

318875472661 is a deficient number, since it is larger than the sum of its proper divisors (1).

318875472661 is an equidigital number, since it uses as much as digits as its factorization.

318875472661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 58.

The spelling of 318875472661 in words is "three hundred eighteen billion, eight hundred seventy-five million, four hundred seventy-two thousand, six hundred sixty-one".