66674593 has 2 divisors, whose sum is σ = 66674594. Its totient is φ = 66674592.

The previous prime is 66674579. The next prime is 66674611. The reversal of 66674593 is 39547666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44462224 + 22212369 = 6668^2 + 4713^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66674593 is a prime.

It is not a weakly prime, because it can be changed into another prime (66674513) 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, 33337296 + 33337297.

It is an arithmetic number, because the mean of its divisors is an integer number (33337297).

Almost surely, 2^66674593 is an apocalyptic number.

It is an amenable number.

66674593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66674593 is an equidigital number, since it uses as much as digits as its factorization.

66674593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 46.

The square root of 66674593 is about 8165.4511816555. The cubic root of 66674593 is about 405.4962022549.

The spelling of 66674593 in words is "sixty-six million, six hundred seventy-four thousand, five hundred ninety-three".