66804677 has 2 divisors, whose sum is σ = 66804678. Its totient is φ = 66804676.

The previous prime is 66804653. The next prime is 66804739. The reversal of 66804677 is 77640866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45144961 + 21659716 = 6719^2 + 4654^2 .

It is a cyclic number.

It is not a de Polignac number, because 66804677 - 2⁶ = 66804613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66804607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33402338 + 33402339.

It is an arithmetic number, because the mean of its divisors is an integer number (33402339).

Almost surely, 2^66804677 is an apocalyptic number.

It is an amenable number.

66804677 is a deficient number, since it is larger than the sum of its proper divisors (1).

66804677 is an equidigital number, since it uses as much as digits as its factorization.

66804677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 66804677 is about 8173.4128122835. The cubic root of 66804677 is about 405.7597424236.

The spelling of 66804677 in words is "sixty-six million, eight hundred four thousand, six hundred seventy-seven".