66704697 has 12 divisors (see below), whose sum is σ = 96453604. Its totient is φ = 44422560.

The previous prime is 66704689. The next prime is 66704749. The reversal of 66704697 is 79640766.

It can be written as a sum of positive squares in 2 ways, for example, as 52142841 + 14561856 = 7221^2 + 3816^2 .

It is not a de Polignac number, because 66704697 - 2³ = 66704689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66704657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6447 + ... + 13227.

Almost surely, 2^66704697 is an apocalyptic number.

It is an amenable number.

66704697 is a deficient number, since it is larger than the sum of its proper divisors (29748907).

66704697 is a wasteful number, since it uses less digits than its factorization.

66704697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7880 (or 7877 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 66704697 is about 8167.2943500280. The cubic root of 66704697 is about 405.5572211048.

The spelling of 66704697 in words is "sixty-six million, seven hundred four thousand, six hundred ninety-seven".