645393307317 has 16 divisors (see below), whose sum is σ = 979569289728. Its totient is φ = 374141047280.

The previous prime is 645393307303. The next prime is 645393307319. The reversal of 645393307317 is 713703393546.

It is a happy number.

It is not a de Polignac number, because 645393307317 - 2⁴ = 645393307301 is a prime.

It is a super-2 number, since 2×645393307317² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645393307317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645393307319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425159523 + ... + 425161040.

It is an arithmetic number, because the mean of its divisors is an integer number (61223080608).

Almost surely, 2^645393307317 is an apocalyptic number.

It is an amenable number.

645393307317 is a deficient number, since it is larger than the sum of its proper divisors (334175982411).

645393307317 is a wasteful number, since it uses less digits than its factorization.

645393307317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850320600.

The product of its (nonzero) digits is 4286520, while the sum is 51.

The spelling of 645393307317 in words is "six hundred forty-five billion, three hundred ninety-three million, three hundred seven thousand, three hundred seventeen".