23955867561 has 4 divisors (see below), whose sum is σ = 31941156752. Its totient is φ = 15970578372.

The previous prime is 23955867521. The next prime is 23955867589. The reversal of 23955867561 is 16576855932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23955867561 - 2⁶ = 23955867497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23955867521) 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, 3992644591 + ... + 3992644596.

It is an arithmetic number, because the mean of its divisors is an integer number (7985289188).

Almost surely, 2^23955867561 is an apocalyptic number.

It is an amenable number.

23955867561 is a deficient number, since it is larger than the sum of its proper divisors (7985289191).

23955867561 is an equidigital number, since it uses as much as digits as its factorization.

23955867561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985289190.

The product of its digits is 13608000, while the sum is 57.

The spelling of 23955867561 in words is "twenty-three billion, nine hundred fifty-five million, eight hundred sixty-seven thousand, five hundred sixty-one".