66618244 has 81 divisors (see below), whose sum is σ = 151930821. Its totient is φ = 25465440.

The previous prime is 66618239. The next prime is 66618247. The reversal of 66618244 is 44281666.

The square root of 66618244 is 8162.

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., 48024900 + 18593344 = 6930^2 + 4312^2 .

It is not an unprimeable number, because it can be changed into a prime (66618247) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1256922 + ... + 1256974.

Almost surely, 2^66618244 is an apocalyptic number.

66618244 is the 8162-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66618244

66618244 is an abundant number, since it is smaller than the sum of its proper divisors (85312577).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66618244 is a wasteful number, since it uses less digits than its factorization.

66618244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 73 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The cubic root of 66618244 is about 405.3819371132.

The spelling of 66618244 in words is "sixty-six million, six hundred eighteen thousand, two hundred forty-four".