8206155442649 has 2 divisors, whose sum is σ = 8206155442650. Its totient is φ = 8206155442648.

The previous prime is 8206155442603. The next prime is 8206155442687. The reversal of 8206155442649 is 9462445516028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7759049247049 + 447106195600 = 2785507^2 + 668660^2 .

It is a cyclic number.

It is not a de Polignac number, because 8206155442649 - 2²⁰ = 8206154394073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8206155442594 and 8206155442603.

It is not a weakly prime, because it can be changed into another prime (8206155442349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4103077721324 + 4103077721325.

It is an arithmetic number, because the mean of its divisors is an integer number (4103077721325).

Almost surely, 2^{8206155442649} is an apocalyptic number.

It is an amenable number.

8206155442649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8206155442649 is an equidigital number, since it uses as much as digits as its factorization.

8206155442649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 8206155442649 in words is "eight trillion, two hundred six billion, one hundred fifty-five million, four hundred forty-two thousand, six hundred forty-nine".