66865983 has 8 divisors (see below), whose sum is σ = 89202096. Its totient is φ = 44553600.

The previous prime is 66865979. The next prime is 66865999. The reversal of 66865983 is 38956866.

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

It is not a de Polignac number, because 66865983 - 2² = 66865979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66865963) 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, 2263 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (11150262).

Almost surely, 2^66865983 is an apocalyptic number.

66865983 is a deficient number, since it is larger than the sum of its proper divisors (22336113).

66865983 is a wasteful number, since it uses less digits than its factorization.

66865983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11865.

The product of its digits is 1866240, while the sum is 51.

The square root of 66865983 is about 8177.1622828460. The cubic root of 66865983 is about 405.8838250598.

The spelling of 66865983 in words is "sixty-six million, eight hundred sixty-five thousand, nine hundred eighty-three".