8158163645 has 4 divisors (see below), whose sum is σ = 9789796380. Its totient is φ = 6526530912.

The previous prime is 8158163621. The next prime is 8158163647. The reversal of 8158163645 is 5463618518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5463618518 = 2 ⋅2731809259.

It can be written as a sum of positive squares in 2 ways, for example, as 2829601636 + 5328562009 = 53194^2 + 72997^2 .

It is a cyclic number.

It is not a de Polignac number, because 8158163645 - 2²⁰ = 8157115069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8158163645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8158163647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815816360 + ... + 815816369.

It is an arithmetic number, because the mean of its divisors is an integer number (2447449095).

Almost surely, 2^8158163645 is an apocalyptic number.

It is an amenable number.

8158163645 is a deficient number, since it is larger than the sum of its proper divisors (1631632735).

8158163645 is a wasteful number, since it uses less digits than its factorization.

8158163645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631632734.

The product of its digits is 691200, while the sum is 47.

The square root of 8158163645 is about 90322.5533573980. The cubic root of 8158163645 is about 2013.0943851881.

The spelling of 8158163645 in words is "eight billion, one hundred fifty-eight million, one hundred sixty-three thousand, six hundred forty-five".