66468917 has 2 divisors, whose sum is σ = 66468918. Its totient is φ = 66468916.

The previous prime is 66468907. The next prime is 66468923. The reversal of 66468917 is 71986466.

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., 62504836 + 3964081 = 7906^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 66468917 - 2⁴ = 66468901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66468907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33234458 + 33234459.

It is an arithmetic number, because the mean of its divisors is an integer number (33234459).

Almost surely, 2^66468917 is an apocalyptic number.

It is an amenable number.

66468917 is a deficient number, since it is larger than the sum of its proper divisors (1).

66468917 is an equidigital number, since it uses as much as digits as its factorization.

66468917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 66468917 is about 8152.8471713874. The cubic root of 66468917 is about 405.0788181711.

The spelling of 66468917 in words is "sixty-six million, four hundred sixty-eight thousand, nine hundred seventeen".