66450289 has 8 divisors (see below), whose sum is σ = 70477632. Its totient is φ = 62517840.

The previous prime is 66450271. The next prime is 66450301. The reversal of 66450289 is 98205466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66450289 - 2⁹ = 66449777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22279 + ... + 25084.

It is an arithmetic number, because the mean of its divisors is an integer number (8809704).

Almost surely, 2^66450289 is an apocalyptic number.

It is an amenable number.

66450289 is a deficient number, since it is larger than the sum of its proper divisors (4027343).

66450289 is a wasteful number, since it uses less digits than its factorization.

66450289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47447.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 66450289 is about 8151.7046683501. The cubic root of 66450289 is about 405.0409733479.

The spelling of 66450289 in words is "sixty-six million, four hundred fifty thousand, two hundred eighty-nine".