8158196493 has 6 divisors (see below), whose sum is σ = 11784061614. Its totient is φ = 5438797656.

The previous prime is 8158196491. The next prime is 8158196549. The reversal of 8158196493 is 3946918518.

It can be written as a sum of positive squares in only one way, i.e., 8116748649 + 41447844 = 90093^2 + 6438^2 .

It is not a de Polignac number, because 8158196493 - 2¹ = 8158196491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8158196491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 453233130 + ... + 453233147.

It is an arithmetic number, because the mean of its divisors is an integer number (1964010269).

Almost surely, 2^8158196493 is an apocalyptic number.

It is an amenable number.

8158196493 is a deficient number, since it is larger than the sum of its proper divisors (3625865121).

8158196493 is a wasteful number, since it uses less digits than its factorization.

8158196493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906466283 (or 906466280 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 8158196493 is about 90322.7351944127. The cubic root of 8158196493 is about 2013.0970870231.

The spelling of 8158196493 in words is "eight billion, one hundred fifty-eight million, one hundred ninety-six thousand, four hundred ninety-three".