23012555551 has 4 divisors (see below), whose sum is σ = 23327796112. Its totient is φ = 22697314992.

The previous prime is 23012555543. The next prime is 23012555569. The reversal of 23012555551 is 15555521032.

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

It is a cyclic number.

It is not a de Polignac number, because 23012555551 - 2³ = 23012555543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23012555051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157620171 + ... + 157620316.

It is an arithmetic number, because the mean of its divisors is an integer number (5831949028).

Almost surely, 2^23012555551 is an apocalyptic number.

23012555551 is a deficient number, since it is larger than the sum of its proper divisors (315240561).

23012555551 is an equidigital number, since it uses as much as digits as its factorization.

23012555551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315240560.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 23012555551 in words is "twenty-three billion, twelve million, five hundred fifty-five thousand, five hundred fifty-one".