85851666 has 24 divisors (see below), whose sum is σ = 196954524. Its totient is φ = 26933760.

The previous prime is 85851653. The next prime is 85851673. The reversal of 85851666 is 66615858.

It can be written as a sum of positive squares in 2 ways, for example, as 81378441 + 4473225 = 9021^2 + 2115^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139975 + ... + 140586.

Almost surely, 2^85851666 is an apocalyptic number.

85851666 is an abundant number, since it is smaller than the sum of its proper divisors (111102858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85851666 is a wasteful number, since it uses less digits than its factorization.

85851666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280586 (or 280583 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 85851666 is about 9265.6174106208. The cubic root of 85851666 is about 441.1465722860.

The spelling of 85851666 in words is "eighty-five million, eight hundred fifty-one thousand, six hundred sixty-six".