23225505581 has 4 divisors (see below), whose sum is σ = 23244404700. Its totient is φ = 23206606464.

The previous prime is 23225505559. The next prime is 23225505607. The reversal of 23225505581 is 18550552232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15532636900 + 7692868681 = 124630^2 + 87709^2 .

It is a cyclic number.

It is not a de Polignac number, because 23225505581 - 2¹⁴ = 23225489197 is a prime.

It is a super-2 number, since 2×23225505581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23225505481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9447716 + ... + 9450173.

It is an arithmetic number, because the mean of its divisors is an integer number (5811101175).

Almost surely, 2^23225505581 is an apocalyptic number.

It is an amenable number.

23225505581 is a deficient number, since it is larger than the sum of its proper divisors (18899119).

23225505581 is a wasteful number, since it uses less digits than its factorization.

23225505581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18899118.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 23225505581 in words is "twenty-three billion, two hundred twenty-five million, five hundred five thousand, five hundred eighty-one".