66232194817 has 2 divisors, whose sum is σ = 66232194818. Its totient is φ = 66232194816.

The previous prime is 66232194799. The next prime is 66232194859. The reversal of 66232194817 is 71849123266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63950317456 + 2281877361 = 252884^2 + 47769^2 .

It is a cyclic number.

It is not a de Polignac number, because 66232194817 - 2¹¹ = 66232192769 is a prime.

It is not a weakly prime, because it can be changed into another prime (66232197817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33116097408 + 33116097409.

It is an arithmetic number, because the mean of its divisors is an integer number (33116097409).

Almost surely, 2^66232194817 is an apocalyptic number.

It is an amenable number.

66232194817 is a deficient number, since it is larger than the sum of its proper divisors (1).

66232194817 is an equidigital number, since it uses as much as digits as its factorization.

66232194817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The spelling of 66232194817 in words is "sixty-six billion, two hundred thirty-two million, one hundred ninety-four thousand, eight hundred seventeen".