645731630360323 has 6 divisors (see below), whose sum is σ = 699224191455444. Its totient is φ = 596059966486296.

The previous prime is 645731630360291. The next prime is 645731630360417. The reversal of 645731630360323 is 323063036137546.

It is not a de Polignac number, because 645731630360323 - 2⁵ = 645731630360291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645731630369323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1910448610365 + ... + 1910448610702.

It is an arithmetic number, because the mean of its divisors is an integer number (116537365242574).

Almost surely, 2^{645731630360323} is an apocalyptic number.

645731630360323 is a deficient number, since it is larger than the sum of its proper divisors (53492561095121).

645731630360323 is a wasteful number, since it uses less digits than its factorization.

645731630360323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820897221093 (or 3820897221080 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 52.

Adding to 645731630360323 its reverse (323063036137546), we get a palindrome (968794666497869).

The spelling of 645731630360323 in words is "six hundred forty-five trillion, seven hundred thirty-one billion, six hundred thirty million, three hundred sixty thousand, three hundred twenty-three".