66774347 has 2 divisors, whose sum is σ = 66774348. Its totient is φ = 66774346.

The previous prime is 66774319. The next prime is 66774353. The reversal of 66774347 is 74347766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66774347 - 2¹² = 66770251 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66774298 and 66774307.

It is not a weakly prime, because it can be changed into another prime (66774377) 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 as a sum of consecutive naturals, namely, 33387173 + 33387174.

It is an arithmetic number, because the mean of its divisors is an integer number (33387174).

Almost surely, 2^66774347 is an apocalyptic number.

66774347 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774347 is an equidigital number, since it uses as much as digits as its factorization.

66774347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 44.

The square root of 66774347 is about 8171.5571955411. The cubic root of 66774347 is about 405.6983267839.

The spelling of 66774347 in words is "sixty-six million, seven hundred seventy-four thousand, three hundred forty-seven".