66899966 has 8 divisors (see below), whose sum is σ = 114685680. Its totient is φ = 28671408.

The previous prime is 66899951. The next prime is 66899983. The reversal of 66899966 is 66999866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2389271 + ... + 2389298.

It is an arithmetic number, because the mean of its divisors is an integer number (14335710).

Almost surely, 2^66899966 is an apocalyptic number.

66899966 is a deficient number, since it is larger than the sum of its proper divisors (47785714).

66899966 is a wasteful number, since it uses less digits than its factorization.

66899966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4778578.

The product of its digits is 7558272, while the sum is 59.

The square root of 66899966 is about 8179.2399402389. The cubic root of 66899966 is about 405.9525735893.

The spelling of 66899966 in words is "sixty-six million, eight hundred ninety-nine thousand, nine hundred sixty-six".