66933091 has 4 divisors (see below), whose sum is σ = 66957192. Its totient is φ = 66908992.

The previous prime is 66933077. The next prime is 66933103. The reversal of 66933091 is 19033966.

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 66933091 - 2²³ = 58544483 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 66933091.

It is not an unprimeable number, because it can be changed into a prime (66933001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7246 + ... + 13651.

It is an arithmetic number, because the mean of its divisors is an integer number (16739298).

Almost surely, 2^66933091 is an apocalyptic number.

66933091 is a deficient number, since it is larger than the sum of its proper divisors (24101).

66933091 is a wasteful number, since it uses less digits than its factorization.

66933091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 66933091 is about 8181.2646332948. The cubic root of 66933091 is about 406.0195639581.

The spelling of 66933091 in words is "sixty-six million, nine hundred thirty-three thousand, ninety-one".