66072697 has 2 divisors, whose sum is σ = 66072698. Its totient is φ = 66072696.

The previous prime is 66072661. The next prime is 66072703. The reversal of 66072697 is 79627066.

It is a happy number.

66072697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58614336 + 7458361 = 7656^2 + 2731^2 .

It is a cyclic number.

It is not a de Polignac number, because 66072697 - 2¹¹ = 66070649 is a prime.

It is not a weakly prime, because it can be changed into another prime (66072637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33036348 + 33036349.

It is an arithmetic number, because the mean of its divisors is an integer number (33036349).

Almost surely, 2^66072697 is an apocalyptic number.

It is an amenable number.

66072697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66072697 is an equidigital number, since it uses as much as digits as its factorization.

66072697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 66072697 is about 8128.5113643274. The cubic root of 66072697 is about 404.2723243987.

The spelling of 66072697 in words is "sixty-six million, seventy-two thousand, six hundred ninety-seven".