66813235 has 4 divisors (see below), whose sum is σ = 80175888. Its totient is φ = 53450584.

The previous prime is 66813233. The next prime is 66813251. The reversal of 66813235 is 53231866.

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

It is a cyclic number.

It is not a de Polignac number, because 66813235 - 2¹ = 66813233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66813235.

It is not an unprimeable number, because it can be changed into a prime (66813233) 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 in 3 ways as a sum of consecutive naturals, for example, 6681319 + ... + 6681328.

It is an arithmetic number, because the mean of its divisors is an integer number (20043972).

Almost surely, 2^66813235 is an apocalyptic number.

66813235 is a deficient number, since it is larger than the sum of its proper divisors (13362653).

66813235 is a wasteful number, since it uses less digits than its factorization.

66813235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13362652.

The product of its digits is 25920, while the sum is 34.

The square root of 66813235 is about 8173.9363222379. The cubic root of 66813235 is about 405.7770682744. Note that the first 3 decimals are identical.

The spelling of 66813235 in words is "sixty-six million, eight hundred thirteen thousand, two hundred thirty-five".