66289394 has 4 divisors (see below), whose sum is σ = 99434094. Its totient is φ = 33144696.

The previous prime is 66289393. The next prime is 66289417. The reversal of 66289394 is 49398266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54213769 + 12075625 = 7363^2 + 3475^2 .

It is not an unprimeable number, because it can be changed into a prime (66289393) 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, 16572347 + ... + 16572350.

Almost surely, 2^66289394 is an apocalyptic number.

66289394 is a deficient number, since it is larger than the sum of its proper divisors (33144700).

66289394 is a wasteful number, since it uses less digits than its factorization.

66289394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33144699.

The product of its digits is 559872, while the sum is 47.

The square root of 66289394 is about 8141.8298925979. The cubic root of 66289394 is about 404.7138027825.

The spelling of 66289394 in words is "sixty-six million, two hundred eighty-nine thousand, three hundred ninety-four".