2645639823 has 16 divisors (see below), whose sum is σ = 3699947520. Its totient is φ = 1679574816.

The previous prime is 2645639809. The next prime is 2645639831. The reversal of 2645639823 is 3289365462.

2645639823 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2645639823 - 2⁸ = 2645639567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645639873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248343 + ... + 258776.

It is an arithmetic number, because the mean of its divisors is an integer number (231246720).

Almost surely, 2^2645639823 is an apocalyptic number.

2645639823 is a deficient number, since it is larger than the sum of its proper divisors (1054307697).

2645639823 is a wasteful number, since it uses less digits than its factorization.

2645639823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507206.

The product of its digits is 1866240, while the sum is 48.

The square root of 2645639823 is about 51435.7834877627. The cubic root of 2645639823 is about 1383.0681269046.

It can be divided in two parts, 2645639 and 823, that added together give a palindrome (2646462).

The spelling of 2645639823 in words is "two billion, six hundred forty-five million, six hundred thirty-nine thousand, eight hundred twenty-three".