23666878009 has 2 divisors, whose sum is σ = 23666878010. Its totient is φ = 23666878008.

The previous prime is 23666877977. The next prime is 23666878019. The reversal of 23666878009 is 90087866632.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18674042409 + 4992835600 = 136653^2 + 70660^2 .

It is a cyclic number.

It is not a de Polignac number, because 23666878009 - 2⁵ = 23666877977 is a prime.

It is a super-2 number, since 2×23666878009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23666878019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11833439004 + 11833439005.

It is an arithmetic number, because the mean of its divisors is an integer number (11833439005).

Almost surely, 2^23666878009 is an apocalyptic number.

It is an amenable number.

23666878009 is a deficient number, since it is larger than the sum of its proper divisors (1).

23666878009 is an equidigital number, since it uses as much as digits as its factorization.

23666878009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 23666878009 in words is "twenty-three billion, six hundred sixty-six million, eight hundred seventy-eight thousand, nine".