8158196549 has 2 divisors, whose sum is σ = 8158196550. Its totient is φ = 8158196548.

The previous prime is 8158196491. The next prime is 8158196551. The reversal of 8158196549 is 9456918518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5931772324 + 2226424225 = 77018^2 + 47185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8158196549 is a prime.

Together with 8158196551, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8158196494 and 8158196503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8158196749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4079098274 + 4079098275.

It is an arithmetic number, because the mean of its divisors is an integer number (4079098275).

Almost surely, 2^8158196549 is an apocalyptic number.

It is an amenable number.

8158196549 is a deficient number, since it is larger than the sum of its proper divisors (1).

8158196549 is an equidigital number, since it uses as much as digits as its factorization.

8158196549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 56.

The square root of 8158196549 is about 90322.7355044122. The cubic root of 8158196549 is about 2013.0970916293.

The spelling of 8158196549 in words is "eight billion, one hundred fifty-eight million, one hundred ninety-six thousand, five hundred forty-nine".