23561329009 has 27 divisors (see below), whose sum is σ = 25088978187. Its totient is φ = 22125671568.

The previous prime is 23561328991. The next prime is 23561329019. The reversal of 23561329009 is 90092316532.

The square root of 23561329009 is 153497.

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

It can be written as a sum of positive squares in only one way, i.e., 12354989409 + 11206339600 = 111153^2 + 105860^2 .

It is not a de Polignac number, because 23561329009 - 2⁵ = 23561328977 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (23561329019) 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, 298244632 + ... + 298244710.

Almost surely, 2^23561329009 is an apocalyptic number.

23561329009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

23561329009 is the 153497-th square number.

23561329009 is the 76749-th centered octagonal number.

It is an amenable number.

23561329009 is a deficient number, since it is larger than the sum of its proper divisors (1527649178).

23561329009 is an frugal number, since it uses more digits than its factorization.

23561329009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 23561329009 in words is "twenty-three billion, five hundred sixty-one million, three hundred twenty-nine thousand, nine".