8166417820 has 24 divisors (see below), whose sum is σ = 18708521328. Its totient is φ = 2969606400.

The previous prime is 8166417739. The next prime is 8166417821. The reversal of 8166417820 is 287146618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8166417821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18559821 + ... + 18560260.

It is an arithmetic number, because the mean of its divisors is an integer number (779521722).

Almost surely, 2^8166417820 is an apocalyptic number.

It is an amenable number.

8166417820 is an abundant number, since it is smaller than the sum of its proper divisors (10542103508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8166417820 is a wasteful number, since it uses less digits than its factorization.

8166417820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37120101 (or 37120099 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 8166417820 is about 90368.2345738811. The cubic root of 8166417820 is about 2013.7730850043.

The spelling of 8166417820 in words is "eight billion, one hundred sixty-six million, four hundred seventeen thousand, eight hundred twenty".