23145044557 has 4 divisors (see below), whose sum is σ = 23374203516. Its totient is φ = 22915885600.

The previous prime is 23145044551. The next prime is 23145044561. The reversal of 23145044557 is 75544054132.

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 17169909156 + 5975135401 = 131034^2 + 77299^2 .

It is a cyclic number.

It is not a de Polignac number, because 23145044557 - 2¹¹ = 23145042509 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 (23145044551) 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, 114579328 + ... + 114579529.

It is an arithmetic number, because the mean of its divisors is an integer number (5843550879).

Almost surely, 2^23145044557 is an apocalyptic number.

It is an amenable number.

23145044557 is a deficient number, since it is larger than the sum of its proper divisors (229158959).

23145044557 is a wasteful number, since it uses less digits than its factorization.

23145044557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229158958.

The product of its (nonzero) digits is 336000, while the sum is 40.

Adding to 23145044557 its reverse (75544054132), we get a palindrome (98689098689).

The spelling of 23145044557 in words is "twenty-three billion, one hundred forty-five million, forty-four thousand, five hundred fifty-seven".