645442323 has 4 divisors (see below), whose sum is σ = 860589768. Its totient is φ = 430294880.

The previous prime is 645442313. The next prime is 645442333. The reversal of 645442323 is 323244546.

645442323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (645442313) and next prime (645442333).

It is a cyclic number.

It is not a de Polignac number, because 645442323 - 2¹⁰ = 645441299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645442313) 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, 107573718 + ... + 107573723.

It is an arithmetic number, because the mean of its divisors is an integer number (215147442).

Almost surely, 2^645442323 is an apocalyptic number.

645442323 is a deficient number, since it is larger than the sum of its proper divisors (215147445).

645442323 is a wasteful number, since it uses less digits than its factorization.

645442323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215147444.

The product of its digits is 69120, while the sum is 33.

The square root of 645442323 is about 25405.5569315061. The cubic root of 645442323 is about 864.2097198058.

Adding to 645442323 its reverse (323244546), we get a palindrome (968686869).

The spelling of 645442323 in words is "six hundred forty-five million, four hundred forty-two thousand, three hundred twenty-three".