66449449 has 6 divisors (see below), whose sum is σ = 73039610. Its totient is φ = 60408480.

The previous prime is 66449437. The next prime is 66449497. The reversal of 66449449 is 94494466.

It can be written as a sum of positive squares in only one way, i.e., 52707600 + 13741849 = 7260^2 + 3707^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66449449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66449399 and 66449408.

It is not an unprimeable number, because it can be changed into a prime (66443449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 274464 + ... + 274705.

Almost surely, 2^66449449 is an apocalyptic number.

It is an amenable number.

66449449 is a deficient number, since it is larger than the sum of its proper divisors (6590161).

66449449 is a wasteful number, since it uses less digits than its factorization.

66449449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549191 (or 549180 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The square root of 66449449 is about 8151.6531452215. The cubic root of 66449449 is about 405.0392666292.

The spelling of 66449449 in words is "sixty-six million, four hundred forty-nine thousand, four hundred forty-nine".