66660086 has 4 divisors (see below), whose sum is σ = 99990132. Its totient is φ = 33330042.

The previous prime is 66660071. The next prime is 66660103. The reversal of 66660086 is 68006666.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16665020 + ... + 16665023.

It is an arithmetic number, because the mean of its divisors is an integer number (24997533).

Almost surely, 2^66660086 is an apocalyptic number.

66660086 is a deficient number, since it is larger than the sum of its proper divisors (33330046).

66660086 is a wasteful number, since it uses less digits than its factorization.

66660086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33330045.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 66660086 is about 8164.5628174447. The cubic root of 66660086 is about 405.4667909512.

The spelling of 66660086 in words is "sixty-six million, six hundred sixty thousand, eighty-six".