666858086 has 16 divisors (see below), whose sum is σ = 1057317360. Its totient is φ = 314565120.

The previous prime is 666858079. The next prime is 666858097. The reversal of 666858086 is 680858666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27251 + ... + 45566.

It is an arithmetic number, because the mean of its divisors is an integer number (66082335).

Almost surely, 2^666858086 is an apocalyptic number.

666858086 is a deficient number, since it is larger than the sum of its proper divisors (390459274).

666858086 is a wasteful number, since it uses less digits than its factorization.

666858086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73079.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The square root of 666858086 is about 25823.5955281212. The cubic root of 666858086 is about 873.6640668304.

It can be divided in two parts, 6668580 and 86, that added together give a palindrome (6668666).

The spelling of 666858086 in words is "six hundred sixty-six million, eight hundred fifty-eight thousand, eighty-six".