645324345723 has 8 divisors (see below), whose sum is σ = 860924987968. Its totient is φ = 429969966984.

The previous prime is 645324345709. The next prime is 645324345767. The reversal of 645324345723 is 327543423546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645324345723 - 2¹⁰ = 645324344699 is a prime.

It is a super-2 number, since 2×645324345723² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645324345223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61559761 + ... + 61570242.

It is an arithmetic number, because the mean of its divisors is an integer number (107615623496).

Almost surely, 2^645324345723 is an apocalyptic number.

645324345723 is a deficient number, since it is larger than the sum of its proper divisors (215600642245).

645324345723 is a wasteful number, since it uses less digits than its factorization.

645324345723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123131753.

The product of its digits is 7257600, while the sum is 48.

The spelling of 645324345723 in words is "six hundred forty-five billion, three hundred twenty-four million, three hundred forty-five thousand, seven hundred twenty-three".