66822716 has 12 divisors (see below), whose sum is σ = 123818688. Its totient is φ = 31445952.

The previous prime is 66822689. The next prime is 66822739. The reversal of 66822716 is 61722866.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66822716.

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, 491276 + ... + 491411.

It is an arithmetic number, because the mean of its divisors is an integer number (10318224).

Almost surely, 2^66822716 is an apocalyptic number.

It is an amenable number.

66822716 is a deficient number, since it is larger than the sum of its proper divisors (56995972).

66822716 is a wasteful number, since it uses less digits than its factorization.

66822716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982708 (or 982706 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 66822716 is about 8174.5162548006. The cubic root of 66822716 is about 405.7962610308.

The spelling of 66822716 in words is "sixty-six million, eight hundred twenty-two thousand, seven hundred sixteen".