23666878121 has 2 divisors, whose sum is σ = 23666878122. Its totient is φ = 23666878120.

The previous prime is 23666878063. The next prime is 23666878127. The reversal of 23666878121 is 12187866632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19020547225 + 4646330896 = 137915^2 + 68164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23666878121 is a prime.

It is a super-2 number, since 2×23666878121² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23666878121.

It is not a weakly prime, because it can be changed into another prime (23666878127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11833439060 + 11833439061.

It is an arithmetic number, because the mean of its divisors is an integer number (11833439061).

Almost surely, 2^23666878121 is an apocalyptic number.

It is an amenable number.

23666878121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23666878121 is an equidigital number, since it uses as much as digits as its factorization.

23666878121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The spelling of 23666878121 in words is "twenty-three billion, six hundred sixty-six million, eight hundred seventy-eight thousand, one hundred twenty-one".