66121833 has 8 divisors (see below), whose sum is σ = 88236000. Its totient is φ = 44044448.

The previous prime is 66121801. The next prime is 66121841. The reversal of 66121833 is 33812166.

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 66121833 - 2⁵ = 66121801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66121833.

It is not an unprimeable number, because it can be changed into a prime (66121873) 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, 4683 + ... + 12416.

It is an arithmetic number, because the mean of its divisors is an integer number (11029500).

Almost surely, 2^66121833 is an apocalyptic number.

It is an amenable number.

66121833 is a deficient number, since it is larger than the sum of its proper divisors (22114167).

66121833 is a wasteful number, since it uses less digits than its factorization.

66121833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18391.

The product of its digits is 5184, while the sum is 30.

The square root of 66121833 is about 8131.5332502548. The cubic root of 66121833 is about 404.3725140571.

Adding to 66121833 its reverse (33812166), we get a palindrome (99933999).

The spelling of 66121833 in words is "sixty-six million, one hundred twenty-one thousand, eight hundred thirty-three".