66897747 has 12 divisors (see below), whose sum is σ = 110434480. Its totient is φ = 38227248.

The previous prime is 66897707. The next prime is 66897749. The reversal of 66897747 is 74779866.

It is not a de Polignac number, because 66897747 - 2⁶ = 66897683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66897693 and 66897702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66897749) 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, 530872 + ... + 530997.

Almost surely, 2^66897747 is an apocalyptic number.

66897747 is a deficient number, since it is larger than the sum of its proper divisors (43536733).

66897747 is a wasteful number, since it uses less digits than its factorization.

66897747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061882 (or 1061879 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 66897747 is about 8179.1042908133. The cubic root of 66897747 is about 405.9480852028.

The spelling of 66897747 in words is "sixty-six million, eight hundred ninety-seven thousand, seven hundred forty-seven".