66966440 has 16 divisors (see below), whose sum is σ = 150674580. Its totient is φ = 26786560.

The previous prime is 66966421. The next prime is 66966443. The reversal of 66966440 is 4466966.

It can be written as a sum of positive squares in 2 ways, for example, as 66945124 + 21316 = 8182^2 + 146^2 .

It is not an unprimeable number, because it can be changed into a prime (66966443) 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, 837041 + ... + 837120.

Almost surely, 2^66966440 is an apocalyptic number.

It is an amenable number.

66966440 is an abundant number, since it is smaller than the sum of its proper divisors (83708140).

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

66966440 is a wasteful number, since it uses less digits than its factorization.

66966440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674172 (or 1674168 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 66966440 is about 8183.3025118225. The cubic root of 66966440 is about 406.0869850103.

The spelling of 66966440 in words is "sixty-six million, nine hundred sixty-six thousand, four hundred forty".