66840033 has 8 divisors (see below), whose sum is σ = 95975488. Its totient is φ = 41132304.

The previous prime is 66840031. The next prime is 66840089. The reversal of 66840033 is 33004866.

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

It is not a de Polignac number, because 66840033 - 2¹ = 66840031 is a prime.

It is a super-2 number, since 2×66840033² = 8935180022882178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66840031) 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, 856885 + ... + 856962.

It is an arithmetic number, because the mean of its divisors is an integer number (11996936).

Almost surely, 2^66840033 is an apocalyptic number.

It is an amenable number.

66840033 is a deficient number, since it is larger than the sum of its proper divisors (29135455).

66840033 is a wasteful number, since it uses less digits than its factorization.

66840033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713863.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66840033 is about 8175.5753925947. The cubic root of 66840033 is about 405.8313118205.

Adding to 66840033 its reverse (33004866), we get a palindrome (99844899).

The spelling of 66840033 in words is "sixty-six million, eight hundred forty thousand, thirty-three".