23505645109 has 2 divisors, whose sum is σ = 23505645110. Its totient is φ = 23505645108.

The previous prime is 23505645103. The next prime is 23505645143. The reversal of 23505645109 is 90154650532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19459413009 + 4046232100 = 139497^2 + 63610^2 .

It is a cyclic number.

It is not a de Polignac number, because 23505645109 - 2⁹ = 23505644597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23505645103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11752822554 + 11752822555.

It is an arithmetic number, because the mean of its divisors is an integer number (11752822555).

Almost surely, 2^23505645109 is an apocalyptic number.

It is an amenable number.

23505645109 is a deficient number, since it is larger than the sum of its proper divisors (1).

23505645109 is an equidigital number, since it uses as much as digits as its factorization.

23505645109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 23505645109 in words is "twenty-three billion, five hundred five million, six hundred forty-five thousand, one hundred nine".