66086690 has 16 divisors (see below), whose sum is σ = 119060928. Its totient is φ = 26411376.

The previous prime is 66086687. The next prime is 66086717. The reversal of 66086690 is 9668066.

66086690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66086690² = 8734901190312200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13289 + ... + 17571.

It is an arithmetic number, because the mean of its divisors is an integer number (7441308).

Almost surely, 2^66086690 is an apocalyptic number.

66086690 is a deficient number, since it is larger than the sum of its proper divisors (52974238).

66086690 is a wasteful number, since it uses less digits than its factorization.

66086690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 66086690 is about 8129.3720544701. The cubic root of 66086690 is about 404.3008615686.

The spelling of 66086690 in words is "sixty-six million, eighty-six thousand, six hundred ninety".