85166521 has 4 divisors (see below), whose sum is σ = 92908944. Its totient is φ = 77424100.

The previous prime is 85166519. The next prime is 85166527. The reversal of 85166521 is 12566158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85166521 - 2¹ = 85166519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85166527) 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 3 ways as a sum of consecutive naturals, for example, 3871195 + ... + 3871216.

It is an arithmetic number, because the mean of its divisors is an integer number (23227236).

Almost surely, 2^85166521 is an apocalyptic number.

It is an amenable number.

85166521 is a deficient number, since it is larger than the sum of its proper divisors (7742423).

85166521 is a wasteful number, since it uses less digits than its factorization.

85166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742422.

The product of its digits is 14400, while the sum is 34.

The square root of 85166521 is about 9228.5709077842. The cubic root of 85166521 is about 439.9699032444.

It can be divided in two parts, 8 and 5166521, that added together give a square (5166529 = 2273²).

The spelling of 85166521 in words is "eighty-five million, one hundred sixty-six thousand, five hundred twenty-one".