66897207 has 24 divisors (see below), whose sum is σ = 106490384. Its totient is φ = 40207104.

The previous prime is 66897203. The next prime is 66897211. The reversal of 66897207 is 70279866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66897203) and next prime (66897211).

It is not a de Polignac number, because 66897207 - 2² = 66897203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66897203) 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 23 ways as a sum of consecutive naturals, for example, 1618 + ... + 11679.

Almost surely, 2^66897207 is an apocalyptic number.

66897207 is a deficient number, since it is larger than the sum of its proper divisors (39593177).

66897207 is a wasteful number, since it uses less digits than its factorization.

66897207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13359 (or 13356 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 66897207 is about 8179.0712797970. The cubic root of 66897207 is about 405.9469929260.

The spelling of 66897207 in words is "sixty-six million, eight hundred ninety-seven thousand, two hundred seven".