8166421855 has 8 divisors (see below), whose sum is σ = 9800493264. Its totient is φ = 6532612800.

The previous prime is 8166421849. The next prime is 8166421867. The reversal of 8166421855 is 5581246618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-8166421855 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11035 + ... + 128275.

It is an arithmetic number, because the mean of its divisors is an integer number (1225061658).

Almost surely, 2^8166421855 is an apocalyptic number.

8166421855 is a deficient number, since it is larger than the sum of its proper divisors (1634071409).

8166421855 is a wasteful number, since it uses less digits than its factorization.

8166421855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131177.

The product of its digits is 460800, while the sum is 46.

The square root of 8166421855 is about 90368.2568992011. The cubic root of 8166421855 is about 2013.7734166705.

The spelling of 8166421855 in words is "eight billion, one hundred sixty-six million, four hundred twenty-one thousand, eight hundred fifty-five".