66397893 has 8 divisors (see below), whose sum is σ = 88607808. Its totient is φ = 44226624.

The previous prime is 66397883. The next prime is 66397921. The reversal of 66397893 is 39879366.

It is a happy number.

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

It is not a de Polignac number, because 66397893 - 2¹² = 66393797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66397813) 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, 5380 + ... + 12717.

It is an arithmetic number, because the mean of its divisors is an integer number (11075976).

Almost surely, 2^66397893 is an apocalyptic number.

It is an amenable number.

66397893 is a deficient number, since it is larger than the sum of its proper divisors (22209915).

66397893 is a wasteful number, since it uses less digits than its factorization.

66397893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19323.

The product of its digits is 1469664, while the sum is 51.

The square root of 66397893 is about 8148.4902282570. The cubic root of 66397893 is about 404.9344871932.

The spelling of 66397893 in words is "sixty-six million, three hundred ninety-seven thousand, eight hundred ninety-three".