66386663 has 4 divisors (see below), whose sum is σ = 75870480. Its totient is φ = 56902848.

The previous prime is 66386659. The next prime is 66386669. The reversal of 66386663 is 36668366.

It is a happy number.

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 66386663 - 2² = 66386659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66386669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741898 + ... + 4741911.

It is an arithmetic number, because the mean of its divisors is an integer number (18967620).

Almost surely, 2^66386663 is an apocalyptic number.

66386663 is a deficient number, since it is larger than the sum of its proper divisors (9483817).

66386663 is an equidigital number, since it uses as much as digits as its factorization.

66386663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9483816.

The product of its digits is 559872, while the sum is 44.

The square root of 66386663 is about 8147.8011144112. The cubic root of 66386663 is about 404.9116567966.

The spelling of 66386663 in words is "sixty-six million, three hundred eighty-six thousand, six hundred sixty-three".