66833391 has 8 divisors (see below), whose sum is σ = 89573680. Its totient is φ = 44324352.

The previous prime is 66833381. The next prime is 66833401. The reversal of 66833391 is 19333866.

It is an interprime number because it is at equal distance from previous prime (66833381) and next prime (66833401).

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

It is not a de Polignac number, because 66833391 - 2¹¹ = 66831343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66833381) 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, 57136 + ... + 58293.

It is an arithmetic number, because the mean of its divisors is an integer number (11196710).

Almost surely, 2^66833391 is an apocalyptic number.

66833391 is a deficient number, since it is larger than the sum of its proper divisors (22740289).

66833391 is a wasteful number, since it uses less digits than its factorization.

66833391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115625.

The product of its digits is 69984, while the sum is 39.

The square root of 66833391 is about 8175.1691725615. The cubic root of 66833391 is about 405.8178686751.

The spelling of 66833391 in words is "sixty-six million, eight hundred thirty-three thousand, three hundred ninety-one".