23823640549 has 6 divisors (see below), whose sum is σ = 24484926354. Its totient is φ = 23179757040.

The previous prime is 23823640537. The next prime is 23823640553. The reversal of 23823640549 is 94504632832.

It can be written as a sum of positive squares in 3 ways, for example, as 4857393025 + 18966247524 = 69695^2 + 137718^2 .

It is not a de Polignac number, because 23823640549 - 2²⁹ = 23286769637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23823640499 and 23823640508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23823640349) 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, 8699742 + ... + 8702479.

It is an arithmetic number, because the mean of its divisors is an integer number (4080821059).

Almost surely, 2^23823640549 is an apocalyptic number.

It is an amenable number.

23823640549 is a deficient number, since it is larger than the sum of its proper divisors (661285805).

23823640549 is an equidigital number, since it uses as much as digits as its factorization.

23823640549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17402295 (or 17402258 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 23823640549 in words is "twenty-three billion, eight hundred twenty-three million, six hundred forty thousand, five hundred forty-nine".