66433791 has 4 divisors (see below), whose sum is σ = 88578392. Its totient is φ = 44289192.

The previous prime is 66433727. The next prime is 66433793. The reversal of 66433791 is 19733466.

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

It is not a de Polignac number, because 66433791 - 2⁶ = 66433727 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 (66433793) 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, 11072296 + ... + 11072301.

It is an arithmetic number, because the mean of its divisors is an integer number (22144598).

Almost surely, 2^66433791 is an apocalyptic number.

66433791 is a deficient number, since it is larger than the sum of its proper divisors (22144601).

66433791 is a wasteful number, since it uses less digits than its factorization.

66433791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22144600.

The product of its digits is 81648, while the sum is 39.

The square root of 66433791 is about 8150.6926699514. The cubic root of 66433791 is about 405.0074499468.

The spelling of 66433791 in words is "sixty-six million, four hundred thirty-three thousand, seven hundred ninety-one".