316721628257 has 4 divisors (see below), whose sum is σ = 316761590976. Its totient is φ = 316681665540.

The previous prime is 316721628149. The next prime is 316721628263. The reversal of 316721628257 is 752826127613.

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 not a de Polignac number, because 316721628257 - 2⁸ = 316721628001 is a prime.

It is a super-3 number, since 3×316721628257³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316721528257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19969469 + ... + 19985322.

It is an arithmetic number, because the mean of its divisors is an integer number (79190397744).

Almost surely, 2^316721628257 is an apocalyptic number.

It is an amenable number.

316721628257 is a deficient number, since it is larger than the sum of its proper divisors (39962719).

316721628257 is an equidigital number, since it uses as much as digits as its factorization.

316721628257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39962718.

The product of its digits is 1693440, while the sum is 50.

The spelling of 316721628257 in words is "three hundred sixteen billion, seven hundred twenty-one million, six hundred twenty-eight thousand, two hundred fifty-seven".