66689086 has 8 divisors (see below), whose sum is σ = 100279440. Its totient is φ = 33262608.

The previous prime is 66689081. The next prime is 66689111. The reversal of 66689086 is 68098666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689081) 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, 39946 + ... + 41581.

It is an arithmetic number, because the mean of its divisors is an integer number (12534930).

Almost surely, 2^66689086 is an apocalyptic number.

66689086 is a deficient number, since it is larger than the sum of its proper divisors (33590354).

66689086 is a wasteful number, since it uses less digits than its factorization.

66689086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81938.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 66689086 is about 8166.3385920497. The cubic root of 66689086 is about 405.5255809154.

The spelling of 66689086 in words is "sixty-six million, six hundred eighty-nine thousand, eighty-six".