66874231 has 2 divisors, whose sum is σ = 66874232. Its totient is φ = 66874230.

The previous prime is 66874229. The next prime is 66874259. The reversal of 66874231 is 13247866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66874231 - 2¹ = 66874229 is a prime.

It is a super-2 number, since 2×66874231² = 8944325543682722, which contains 22 as substring.

Together with 66874229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66874201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33437115 + 33437116.

It is an arithmetic number, because the mean of its divisors is an integer number (33437116).

Almost surely, 2^66874231 is an apocalyptic number.

66874231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66874231 is an equidigital number, since it uses as much as digits as its factorization.

66874231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 66874231 is about 8177.6665987310. Note that the first 3 decimals coincide. The cubic root of 66874231 is about 405.9005131275.

The spelling of 66874231 in words is "sixty-six million, eight hundred seventy-four thousand, two hundred thirty-one".