66874281 has 24 divisors (see below), whose sum is σ = 96576480. Its totient is φ = 41046912.

The previous prime is 66874273. The next prime is 66874309. The reversal of 66874281 is 18247866.

It is not a de Polignac number, because 66874281 - 2³ = 66874273 is a prime.

It is a super-2 number, since 2×66874281² = 8944338918533922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66874201) 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 23 ways as a sum of consecutive naturals, for example, 77605 + ... + 78461.

It is an arithmetic number, because the mean of its divisors is an integer number (4024020).

Almost surely, 2^66874281 is an apocalyptic number.

It is an amenable number.

66874281 is a deficient number, since it is larger than the sum of its proper divisors (29702199).

66874281 is a wasteful number, since it uses less digits than its factorization.

66874281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 916 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 66874281 is about 8177.6696558372. The cubic root of 66874281 is about 405.9006142877.

The spelling of 66874281 in words is "sixty-six million, eight hundred seventy-four thousand, two hundred eighty-one".