85166627666 has 4 divisors (see below), whose sum is σ = 127749941502. Its totient is φ = 42583313832.

The previous prime is 85166627633. The next prime is 85166627669. The reversal of 85166627666 is 66672666158.

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

It can be written as a sum of positive squares in only one way, i.e., 82299560641 + 2867067025 = 286879^2 + 53545^2 .

It is not an unprimeable number, because it can be changed into a prime (85166627669) by changing a digit.

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 as a sum of consecutive naturals, namely, 21291656915 + ... + 21291656918.

Almost surely, 2^85166627666 is an apocalyptic number.

85166627666 is a deficient number, since it is larger than the sum of its proper divisors (42583313836).

85166627666 is a wasteful number, since it uses less digits than its factorization.

85166627666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42583313835.

The product of its digits is 26127360, while the sum is 59.

The spelling of 85166627666 in words is "eighty-five billion, one hundred sixty-six million, six hundred twenty-seven thousand, six hundred sixty-six".