66308449 has 9 divisors (see below), whose sum is σ = 70585747. Its totient is φ = 62277664.

The previous prime is 66308447. The next prime is 66308467. The reversal of 66308449 is 94480366.

66308449 = T₁₆₀ + T₁₆₁ + ... + T₇₃₇.

The square root of 66308449 is 8143.

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., 51624225 + 14684224 = 7185^2 + 3832^2 .

It is not a de Polignac number, because 66308449 - 2¹ = 66308447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66308443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 138192 + ... + 138670.

Almost surely, 2^66308449 is an apocalyptic number.

66308449 is the 8143-rd square number.

66308449 is the 4072-nd centered octagonal number.

It is an amenable number.

66308449 is a deficient number, since it is larger than the sum of its proper divisors (4277298).

66308449 is an frugal number, since it uses more digits than its factorization.

66308449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The cubic root of 66308449 is about 404.7525776263.

The spelling of 66308449 in words is "sixty-six million, three hundred eight thousand, four hundred forty-nine".