85507666 has 16 divisors (see below), whose sum is σ = 132949080. Its totient is φ = 41212800.

The previous prime is 85507661. The next prime is 85507691. The reversal of 85507666 is 66670558.

It can be written as a sum of positive squares in 4 ways, for example, as 83997225 + 1510441 = 9165^2 + 1229^2 .

It is not an unprimeable number, because it can be changed into a prime (85507661) by changing a digit.

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, 2766 + ... + 13366.

Almost surely, 2^85507666 is an apocalyptic number.

85507666 is a deficient number, since it is larger than the sum of its proper divisors (47441414).

85507666 is a wasteful number, since it uses less digits than its factorization.

85507666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 85507666 is about 9247.0355249669. The cubic root of 85507666 is about 440.5565718462.

The spelling of 85507666 in words is "eighty-five million, five hundred seven thousand, six hundred sixty-six".