66225566 has 16 divisors (see below), whose sum is σ = 109367280. Its totient is φ = 29825280.

The previous prime is 66225541. The next prime is 66225581. The reversal of 66225566 is 66552266.

It is a Curzon number.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11411 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (6835455).

Almost surely, 2^66225566 is an apocalyptic number.

66225566 is a deficient number, since it is larger than the sum of its proper divisors (43141714).

66225566 is a wasteful number, since it uses less digits than its factorization.

66225566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27739.

The product of its digits is 129600, while the sum is 38.

The square root of 66225566 is about 8137.9091909409. The cubic root of 66225566 is about 404.5838656163.

The spelling of 66225566 in words is "sixty-six million, two hundred twenty-five thousand, five hundred sixty-six".