8217056155823 has 2 divisors, whose sum is σ = 8217056155824. Its totient is φ = 8217056155822.

The previous prime is 8217056155787. The next prime is 8217056155831. The reversal of 8217056155823 is 3285516507128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8217056155823 - 2¹² = 8217056151727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8217056155843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108528077911 + 4108528077912.

It is an arithmetic number, because the mean of its divisors is an integer number (4108528077912).

Almost surely, 2^{8217056155823} is an apocalyptic number.

8217056155823 is a deficient number, since it is larger than the sum of its proper divisors (1).

8217056155823 is an equidigital number, since it uses as much as digits as its factorization.

8217056155823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 8217056155823 in words is "eight trillion, two hundred seventeen billion, fifty-six million, one hundred fifty-five thousand, eight hundred twenty-three".