85166421 has 4 divisors (see below), whose sum is σ = 113555232. Its totient is φ = 56777612.

The previous prime is 85166407. The next prime is 85166423. The reversal of 85166421 is 12466158.

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 85166421 - 2⁷ = 85166293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85166423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14194401 + ... + 14194406.

It is an arithmetic number, because the mean of its divisors is an integer number (28388808).

Almost surely, 2^85166421 is an apocalyptic number.

It is an amenable number.

85166421 is a deficient number, since it is larger than the sum of its proper divisors (28388811).

85166421 is a wasteful number, since it uses less digits than its factorization.

85166421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28388810.

The product of its digits is 11520, while the sum is 33.

The square root of 85166421 is about 9228.5654898256. The cubic root of 85166421 is about 439.9697310445.

The spelling of 85166421 in words is "eighty-five million, one hundred sixty-six thousand, four hundred twenty-one".