66677287 has 4 divisors (see below), whose sum is σ = 67426560. Its totient is φ = 65928016.

The previous prime is 66677267. The next prime is 66677291. The reversal of 66677287 is 78277666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66677287 - 2¹¹ = 66675239 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 66677287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374503 + ... + 374680.

It is an arithmetic number, because the mean of its divisors is an integer number (16856640).

Almost surely, 2^66677287 is an apocalyptic number.

66677287 is a deficient number, since it is larger than the sum of its proper divisors (749273).

66677287 is an equidigital number, since it uses as much as digits as its factorization.

66677287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749272.

The product of its digits is 1185408, while the sum is 49.

The square root of 66677287 is about 8165.6161433170. The cubic root of 66677287 is about 405.5016635658.

The spelling of 66677287 in words is "sixty-six million, six hundred seventy-seven thousand, two hundred eighty-seven".