66716224 has 21 divisors (see below), whose sum is σ = 132519801. Its totient is φ = 33325440.

The previous prime is 66716203. The next prime is 66716297. The reversal of 66716224 is 42261766.

The square root of 66716224 is 8168.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 38837824 + 27878400 = 6232^2 + 5280^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66716224.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64834 + ... + 65854.

Almost surely, 2^66716224 is an apocalyptic number.

66716224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

66716224 is the 8168-th square number.

It is an amenable number.

66716224 is a deficient number, since it is larger than the sum of its proper divisors (65803577).

66716224 is an frugal number, since it uses more digits than its factorization.

66716224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054 (or 1023 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The cubic root of 66716224 is about 405.5805807233.

The spelling of 66716224 in words is "sixty-six million, seven hundred sixteen thousand, two hundred twenty-four".