66843967 has 12 divisors (see below), whose sum is σ = 70064704. Its totient is φ = 63704160.

The previous prime is 66843937. The next prime is 66843979. The reversal of 66843967 is 76934866.

It is not a de Polignac number, because 66843967 - 2⁷ = 66843839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66843967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66843937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213403 + ... + 213715.

Almost surely, 2^66843967 is an apocalyptic number.

66843967 is a deficient number, since it is larger than the sum of its proper divisors (3220737).

66843967 is an equidigital number, since it uses as much as digits as its factorization.

66843967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 427 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 66843967 is about 8175.8159837413. The cubic root of 66843967 is about 405.8392736611.

The spelling of 66843967 in words is "sixty-six million, eight hundred forty-three thousand, nine hundred sixty-seven".