66233993 has 8 divisors (see below), whose sum is σ = 76274880. Its totient is φ = 56337840.

The previous prime is 66233977. The next prime is 66234001. The reversal of 66233993 is 39933266.

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

It is a cyclic number.

It is not a de Polignac number, because 66233993 - 2⁴ = 66233977 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 66233993.

It is not an unprimeable number, because it can be changed into a prime (66233903) 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, 35198 + ... + 37031.

It is an arithmetic number, because the mean of its divisors is an integer number (9534360).

Almost surely, 2^66233993 is an apocalyptic number.

It is an amenable number.

66233993 is a deficient number, since it is larger than the sum of its proper divisors (10040887).

66233993 is a wasteful number, since it uses less digits than its factorization.

66233993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72367.

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

The square root of 66233993 is about 8138.4269364540. The cubic root of 66233993 is about 404.6010255735.

The spelling of 66233993 in words is "sixty-six million, two hundred thirty-three thousand, nine hundred ninety-three".