23545981809 has 27 divisors (see below), whose sum is σ = 39569071737. Its totient is φ = 13453005384.

The previous prime is 23545981807. The next prime is 23545981829. The reversal of 23545981809 is 90818954532.

The square root of 23545981809 is 153447.

It is a perfect power (a square), and thus also a powerful number.

23545981809 is a `hidden beast` number, since 2 + 3 + 5 + 459 + 8 + 180 + 9 = 666.

It is not a de Polignac number, because 23545981809 - 2¹ = 23545981807 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (23545981807) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3218734 + ... + 3226040.

Almost surely, 2^23545981809 is an apocalyptic number.

23545981809 is the 153447-th square number.

23545981809 is the 76724-th centered octagonal number.

It is an amenable number.

23545981809 is a deficient number, since it is larger than the sum of its proper divisors (16023089928).

23545981809 is an frugal number, since it uses more digits than its factorization.

23545981809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14634 (or 7317 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 23545981809 in words is "twenty-three billion, five hundred forty-five million, nine hundred eighty-one thousand, eight hundred nine".