66930173909 has 2 divisors, whose sum is σ = 66930173910. Its totient is φ = 66930173908.

The previous prime is 66930173897. The next prime is 66930173917. The reversal of 66930173909 is 90937103966.

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., 45226402225 + 21703771684 = 212665^2 + 147322^2 .

It is a cyclic number.

It is not a de Polignac number, because 66930173909 - 2²⁸ = 66661738453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66930143909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33465086954 + 33465086955.

It is an arithmetic number, because the mean of its divisors is an integer number (33465086955).

Almost surely, 2^66930173909 is an apocalyptic number.

It is an amenable number.

66930173909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66930173909 is an equidigital number, since it uses as much as digits as its factorization.

66930173909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1653372, while the sum is 53.

The spelling of 66930173909 in words is "sixty-six billion, nine hundred thirty million, one hundred seventy-three thousand, nine hundred nine".