8166810805780 has 72 divisors (see below), whose sum is σ = 18852253426944. Its totient is φ = 2969576998080.

The previous prime is 8166810805759. The next prime is 8166810805781. The reversal of 8166810805780 is 875080186618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8166810805781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46102137 + ... + 46278943.

It is an arithmetic number, because the mean of its divisors is an integer number (261836853152).

Almost surely, 2^{8166810805780} is an apocalyptic number.

It is an amenable number.

8166810805780 is an abundant number, since it is smaller than the sum of its proper divisors (10685442621164).

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

8166810805780 is a wasteful number, since it uses less digits than its factorization.

8166810805780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195925 (or 195912 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 58.

The spelling of 8166810805780 in words is "eight trillion, one hundred sixty-six billion, eight hundred ten million, eight hundred five thousand, seven hundred eighty".