66395993 has 8 divisors (see below), whose sum is σ = 69050880. Its totient is φ = 63765520.

The previous prime is 66395983. The next prime is 66396023. The reversal of 66395993 is 39959366.

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 66395993 - 2⁸ = 66395737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66395983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 11532.

It is an arithmetic number, because the mean of its divisors is an integer number (8631360).

Almost surely, 2^66395993 is an apocalyptic number.

It is an amenable number.

66395993 is a deficient number, since it is larger than the sum of its proper divisors (2654887).

66395993 is a wasteful number, since it uses less digits than its factorization.

66395993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12207.

The product of its digits is 1180980, while the sum is 50.

The square root of 66395993 is about 8148.3736414084. The cubic root of 66395993 is about 404.9306247068.

The spelling of 66395993 in words is "sixty-six million, three hundred ninety-five thousand, nine hundred ninety-three".