66673393637 has 2 divisors, whose sum is σ = 66673393638. Its totient is φ = 66673393636.

The previous prime is 66673393609. The next prime is 66673393651. The reversal of 66673393637 is 73639337666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66062364676 + 611028961 = 257026^2 + 24719^2 .

It is a cyclic number.

It is not a de Polignac number, because 66673393637 - 2¹⁸ = 66673131493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66673395637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336696818 + 33336696819.

It is an arithmetic number, because the mean of its divisors is an integer number (33336696819).

Almost surely, 2^66673393637 is an apocalyptic number.

It is an amenable number.

66673393637 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673393637 is an equidigital number, since it uses as much as digits as its factorization.

66673393637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 59.

The spelling of 66673393637 in words is "sixty-six billion, six hundred seventy-three million, three hundred ninety-three thousand, six hundred thirty-seven".