66239393 has 24 divisors (see below), whose sum is σ = 77246400. Its totient is φ = 56659680.

The previous prime is 66239387. The next prime is 66239401. The reversal of 66239393 is 39393266.

It is not a de Polignac number, because 66239393 - 2⁸ = 66239137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66239393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66239323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150668 + ... + 151106.

It is an arithmetic number, because the mean of its divisors is an integer number (3218600).

Almost surely, 2^66239393 is an apocalyptic number.

It is an amenable number.

66239393 is a deficient number, since it is larger than the sum of its proper divisors (11007007).

66239393 is a wasteful number, since it uses less digits than its factorization.

66239393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 522 counting only the distinct ones).

The product of its digits is 157464, while the sum is 41.

The square root of 66239393 is about 8138.7586891368. The cubic root of 66239393 is about 404.6120208649.

The spelling of 66239393 in words is "sixty-six million, two hundred thirty-nine thousand, three hundred ninety-three".