66774667 has 4 divisors (see below), whose sum is σ = 66813120. Its totient is φ = 66736216.

The previous prime is 66774661. The next prime is 66774707. The reversal of 66774667 is 76647766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66774667 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 66774667.

It is not an unprimeable number, because it can be changed into a prime (66774661) 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 3 ways as a sum of consecutive naturals, for example, 16492 + ... + 20137.

It is an arithmetic number, because the mean of its divisors is an integer number (16703280).

Almost surely, 2^66774667 is an apocalyptic number.

66774667 is a deficient number, since it is larger than the sum of its proper divisors (38453).

66774667 is a wasteful number, since it uses less digits than its factorization.

66774667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38452.

The product of its digits is 1778112, while the sum is 49.

The square root of 66774667 is about 8171.5767756290. The cubic root of 66774667 is about 405.6989748534.

The spelling of 66774667 in words is "sixty-six million, seven hundred seventy-four thousand, six hundred sixty-seven".