8158136133821 has 32 divisors (see below), whose sum is σ = 8724891322080. Its totient is φ = 7601369481216.

The previous prime is 8158136133817. The next prime is 8158136133853. The reversal of 8158136133821 is 1283316318518.

It can be written as a sum of positive squares in 16 ways, for example, as 976566909796 + 7181569224025 = 988214^2 + 2679845^2 .

It is not a de Polignac number, because 8158136133821 - 2² = 8158136133817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8158136133821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8158136133811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1566159065 + ... + 1566164273.

It is an arithmetic number, because the mean of its divisors is an integer number (272652853815).

Almost surely, 2^{8158136133821} is an apocalyptic number.

It is an amenable number.

8158136133821 is a deficient number, since it is larger than the sum of its proper divisors (566755188259).

8158136133821 is a wasteful number, since it uses less digits than its factorization.

8158136133821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073.

The product of its digits is 829440, while the sum is 50.

The spelling of 8158136133821 in words is "eight trillion, one hundred fifty-eight billion, one hundred thirty-six million, one hundred thirty-three thousand, eight hundred twenty-one".