66698033 has 4 divisors (see below), whose sum is σ = 66719268. Its totient is φ = 66676800.

The previous prime is 66698017. The next prime is 66698069. The reversal of 66698033 is 33089666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26337424 + 40360609 = 5132^2 + 6353^2 .

It is a cyclic number.

It is not a de Polignac number, because 66698033 - 2⁴ = 66698017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66698003) 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 in 3 ways as a sum of consecutive naturals, for example, 4868 + ... + 12533.

It is an arithmetic number, because the mean of its divisors is an integer number (16679817).

Almost surely, 2^66698033 is an apocalyptic number.

It is an amenable number.

66698033 is a deficient number, since it is larger than the sum of its proper divisors (21235).

66698033 is a wasteful number, since it uses less digits than its factorization.

66698033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21234.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 66698033 is about 8166.8863711943. The cubic root of 66698033 is about 405.5437151926.

The spelling of 66698033 in words is "sixty-six million, six hundred ninety-eight thousand, thirty-three".