66886418 has 4 divisors (see below), whose sum is σ = 100329630. Its totient is φ = 33443208.

The previous prime is 66886411. The next prime is 66886429. The reversal of 66886418 is 81468866.

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

It can be written as a sum of positive squares in only one way, i.e., 55100929 + 11785489 = 7423^2 + 3433^2 .

It is not an unprimeable number, because it can be changed into a prime (66886411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16721603 + ... + 16721606.

Almost surely, 2^66886418 is an apocalyptic number.

66886418 is a deficient number, since it is larger than the sum of its proper divisors (33443212).

66886418 is a wasteful number, since it uses less digits than its factorization.

66886418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33443211.

The product of its digits is 442368, while the sum is 47.

The square root of 66886418 is about 8178.4117039924. The cubic root of 66886418 is about 405.9251684096.

The spelling of 66886418 in words is "sixty-six million, eight hundred eighty-six thousand, four hundred eighteen".