66845320 has 16 divisors (see below), whose sum is σ = 150402060. Its totient is φ = 26738112.

The previous prime is 66845299. The next prime is 66845321. The reversal of 66845320 is 2354866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66487716 + 357604 = 8154^2 + 598^2 .

It is not an unprimeable number, because it can be changed into a prime (66845321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835527 + ... + 835606.

Almost surely, 2^66845320 is an apocalyptic number.

It is an amenable number.

66845320 is an abundant number, since it is smaller than the sum of its proper divisors (83556740).

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

66845320 is a wasteful number, since it uses less digits than its factorization.

66845320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671144 (or 1671140 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 66845320 is about 8175.8987273571. The cubic root of 66845320 is about 405.8420118630.

The spelling of 66845320 in words is "sixty-six million, eight hundred forty-five thousand, three hundred twenty".