66800693 has 4 divisors (see below), whose sum is σ = 67462188. Its totient is φ = 66139200.

The previous prime is 66800689. The next prime is 66800711. The reversal of 66800693 is 39600866.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45252529 + 21548164 = 6727^2 + 4642^2 .

It is a cyclic number.

It is not a de Polignac number, because 66800693 - 2² = 66800689 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 (66800093) 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, 330596 + ... + 330797.

It is an arithmetic number, because the mean of its divisors is an integer number (16865547).

Almost surely, 2^66800693 is an apocalyptic number.

It is an amenable number.

66800693 is a deficient number, since it is larger than the sum of its proper divisors (661495).

66800693 is a wasteful number, since it uses less digits than its factorization.

66800693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661494.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 66800693 is about 8173.1690916070. The cubic root of 66800693 is about 405.7516762271.

The spelling of 66800693 in words is "sixty-six million, eight hundred thousand, six hundred ninety-three".