67066281 has 6 divisors (see below), whose sum is σ = 96873530. Its totient is φ = 44710848.

The previous prime is 67066277. The next prime is 67066289. The reversal of 67066281 is 18266076.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 15872256 = 7155^2 + 3984^2 .

It is not a de Polignac number, because 67066281 - 2² = 67066277 is a prime.

It is a super-2 number, since 2×67066281² = 8995772094341922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67066289) 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, 3725896 + ... + 3725913.

Almost surely, 2^67066281 is an apocalyptic number.

It is an amenable number.

67066281 is a deficient number, since it is larger than the sum of its proper divisors (29807249).

67066281 is a wasteful number, since it uses less digits than its factorization.

67066281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7451815 (or 7451812 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 67066281 is about 8189.4005275112. The cubic root of 67066281 is about 406.2886979783.

The spelling of 67066281 in words is "sixty-seven million, sixty-six thousand, two hundred eighty-one".