23145044561 has 2 divisors, whose sum is σ = 23145044562. Its totient is φ = 23145044560.

The previous prime is 23145044551. The next prime is 23145044567. The reversal of 23145044561 is 16544054132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16481424400 + 6663620161 = 128380^2 + 81631^2 .

It is a cyclic number.

It is not a de Polignac number, because 23145044561 - 2⁶ = 23145044497 is a prime.

It is not a weakly prime, because it can be changed into another prime (23145044567) 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 as a sum of consecutive naturals, namely, 11572522280 + 11572522281.

It is an arithmetic number, because the mean of its divisors is an integer number (11572522281).

Almost surely, 2^23145044561 is an apocalyptic number.

It is an amenable number.

23145044561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23145044561 is an equidigital number, since it uses as much as digits as its factorization.

23145044561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 23145044561 its reverse (16544054132), we get a palindrome (39689098693).

The spelling of 23145044561 in words is "twenty-three billion, one hundred forty-five million, forty-four thousand, five hundred sixty-one".