820158273108 has 18 divisors (see below), whose sum is σ = 2073177857114. Its totient is φ = 273386091024.

The previous prime is 820158273107. The next prime is 820158273133. The reversal of 820158273108 is 801372851028.

It can be written as a sum of positive squares in only one way, i.e., 816894207684 + 3264065424 = 903822^2 + 57132^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820158273107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11391087091 + ... + 11391087162.

Almost surely, 2^820158273108 is an apocalyptic number.

It is an amenable number.

820158273108 is an abundant number, since it is smaller than the sum of its proper divisors (1253019584006).

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

820158273108 is a wasteful number, since it uses less digits than its factorization.

820158273108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22782174263 (or 22782174258 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 820158273108 in words is "eight hundred twenty billion, one hundred fifty-eight million, two hundred seventy-three thousand, one hundred eight".