645268423 has 6 divisors (see below), whose sum is σ = 652608104. Its totient is φ = 638010384.

The previous prime is 645268411. The next prime is 645268447. The reversal of 645268423 is 324862546.

645268423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645268423 - 2¹⁷ = 645137351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645268523) 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, 32811 + ... + 48652.

Almost surely, 2^645268423 is an apocalyptic number.

645268423 is a deficient number, since it is larger than the sum of its proper divisors (7339681).

645268423 is an frugal number, since it uses more digits than its factorization.

645268423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81641 (or 81552 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 645268423 is about 25402.1342213602. The cubic root of 645268423 is about 864.1320988400.

The spelling of 645268423 in words is "six hundred forty-five million, two hundred sixty-eight thousand, four hundred twenty-three".