23987557109 has 2 divisors, whose sum is σ = 23987557110. Its totient is φ = 23987557108.

The previous prime is 23987557093. The next prime is 23987557117. The reversal of 23987557109 is 90175578932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20857714084 + 3129843025 = 144422^2 + 55945^2 .

It is a cyclic number.

It is not a de Polignac number, because 23987557109 - 2⁴ = 23987557093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23987557169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11993778554 + 11993778555.

It is an arithmetic number, because the mean of its divisors is an integer number (11993778555).

Almost surely, 2^23987557109 is an apocalyptic number.

It is an amenable number.

23987557109 is a deficient number, since it is larger than the sum of its proper divisors (1).

23987557109 is an equidigital number, since it uses as much as digits as its factorization.

23987557109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 23987557109 in words is "twenty-three billion, nine hundred eighty-seven million, five hundred fifty-seven thousand, one hundred nine".