645316531223 has 24 divisors (see below), whose sum is σ = 816267318048. Its totient is φ = 505622972736.

The previous prime is 645316531217. The next prime is 645316531267. The reversal of 645316531223 is 322135613546.

It is a de Polignac number, because none of the positive numbers 2^k-645316531223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645316539223) 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 23 ways as a sum of consecutive naturals, for example, 4852136 + ... + 4983357.

It is an arithmetic number, because the mean of its divisors is an integer number (34011138252).

Almost surely, 2^645316531223 is an apocalyptic number.

645316531223 is a deficient number, since it is larger than the sum of its proper divisors (170950786825).

645316531223 is a wasteful number, since it uses less digits than its factorization.

645316531223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9835623 (or 9835616 counting only the distinct ones).

The product of its digits is 388800, while the sum is 41.

The spelling of 645316531223 in words is "six hundred forty-five billion, three hundred sixteen million, five hundred thirty-one thousand, two hundred twenty-three".