66449616 has 40 divisors (see below), whose sum is σ = 177202944. Its totient is φ = 21434880.

The previous prime is 66449611. The next prime is 66449627. The reversal of 66449616 is 61694466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66449611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20841 + ... + 23816.

Almost surely, 2^66449616 is an apocalyptic number.

It is an amenable number.

66449616 is an abundant number, since it is smaller than the sum of its proper divisors (110753328).

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

66449616 is a wasteful number, since it uses less digits than its factorization.

66449616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44699 (or 44693 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 66449616 is about 8151.6633885361. The cubic root of 66449616 is about 405.0396059423.

The spelling of 66449616 in words is "sixty-six million, four hundred forty-nine thousand, six hundred sixteen".