316665540521 has 4 divisors (see below), whose sum is σ = 345453316944. Its totient is φ = 287877764100.

The previous prime is 316665540463. The next prime is 316665540523. The reversal of 316665540521 is 125045566613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316665540521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316665540523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14393888195 + ... + 14393888216.

It is an arithmetic number, because the mean of its divisors is an integer number (86363329236).

Almost surely, 2^316665540521 is an apocalyptic number.

It is an amenable number.

316665540521 is a deficient number, since it is larger than the sum of its proper divisors (28787776423).

316665540521 is a wasteful number, since it uses less digits than its factorization.

316665540521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28787776422.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 316665540521 in words is "three hundred sixteen billion, six hundred sixty-five million, five hundred forty thousand, five hundred twenty-one".