316665538081 has 4 divisors (see below), whose sum is σ = 335292922692. Its totient is φ = 298038153472.

The previous prime is 316665538061. The next prime is 316665538093. The reversal of 316665538081 is 180835566613.

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 122258619025 + 194406919056 = 349655^2 + 440916^2 .

It is a cyclic number.

It is not a de Polignac number, because 316665538081 - 2²⁵ = 316631983649 is a prime.

It is a super-2 number, since 2×316665538081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316665538061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9313692280 + ... + 9313692313.

It is an arithmetic number, because the mean of its divisors is an integer number (83823230673).

Almost surely, 2^316665538081 is an apocalyptic number.

It is an amenable number.

316665538081 is a deficient number, since it is larger than the sum of its proper divisors (18627384611).

316665538081 is a wasteful number, since it uses less digits than its factorization.

316665538081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18627384610.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 316665538081 in words is "three hundred sixteen billion, six hundred sixty-five million, five hundred thirty-eight thousand, eighty-one".