23005558561 has 4 divisors (see below), whose sum is σ = 23627330452. Its totient is φ = 22383786672.

The previous prime is 23005558559. The next prime is 23005558577. The reversal of 23005558561 is 16585550032.

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 12759057936 + 10246500625 = 112956^2 + 101225^2 .

It is a cyclic number.

It is not a de Polignac number, because 23005558561 - 2¹ = 23005558559 is a prime.

It is a super-3 number, since 3×23005558561³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23005558661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310885890 + ... + 310885963.

It is an arithmetic number, because the mean of its divisors is an integer number (5906832613).

Almost surely, 2^23005558561 is an apocalyptic number.

It is an amenable number.

23005558561 is a deficient number, since it is larger than the sum of its proper divisors (621771891).

23005558561 is an equidigital number, since it uses as much as digits as its factorization.

23005558561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621771890.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 23005558561 in words is "twenty-three billion, five million, five hundred fifty-eight thousand, five hundred sixty-one".