315664618904209 has 3 divisors (see below), whose sum is σ = 315664636671163. Its totient is φ = 315664601137256.

The previous prime is 315664618904179. The next prime is 315664618904249. The reversal of 315664618904209 is 902409816466513.

The square root of 315664618904209 is 17766953.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 95862408174225 + 219802210729984 = 9790935^2 + 14825728^2 .

It is not a de Polignac number, because 315664618904209 - 2¹⁹ = 315664618379921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315664618904249) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8883477 + ... + 26650429.

Almost surely, 2^{315664618904209} is an apocalyptic number.

315664618904209 is the 17766953-rd square number.

315664618904209 is the 8883477-th centered octagonal number.

It is an amenable number.

315664618904209 is a deficient number, since it is larger than the sum of its proper divisors (17766954).

315664618904209 is an frugal number, since it uses more digits than its factorization.

315664618904209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35533906 (or 17766953 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 64.

The spelling of 315664618904209 in words is "three hundred fifteen trillion, six hundred sixty-four billion, six hundred eighteen million, nine hundred four thousand, two hundred nine".