66449216 has 14 divisors (see below), whose sum is σ = 131860290. Its totient is φ = 33224576.

The previous prime is 66449203. The next prime is 66449221. The reversal of 66449216 is 61294466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 774400 = 8104^2 + 880^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66449216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519071 + ... + 519198.

Almost surely, 2^66449216 is an apocalyptic number.

It is an amenable number.

66449216 is a deficient number, since it is larger than the sum of its proper divisors (65411074).

66449216 is a wasteful number, since it uses less digits than its factorization.

66449216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038281 (or 1038271 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 66449216 is about 8151.6388536294. The cubic root of 66449216 is about 405.0387932154.

The spelling of 66449216 in words is "sixty-six million, four hundred forty-nine thousand, two hundred sixteen".