158221852717 has 2 divisors, whose sum is σ = 158221852718. Its totient is φ = 158221852716.

The previous prime is 158221852597. The next prime is 158221852741. The reversal of 158221852717 is 717258122851.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139094686116 + 19127166601 = 372954^2 + 138301^2 .

It is a cyclic number.

It is not a de Polignac number, because 158221852717 - 2²³ = 158213464109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158221852757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79110926358 + 79110926359.

It is an arithmetic number, because the mean of its divisors is an integer number (79110926359).

Almost surely, 2^158221852717 is an apocalyptic number.

It is an amenable number.

158221852717 is a deficient number, since it is larger than the sum of its proper divisors (1).

158221852717 is an equidigital number, since it uses as much as digits as its factorization.

158221852717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 49.

The spelling of 158221852717 in words is "one hundred fifty-eight billion, two hundred twenty-one million, eight hundred fifty-two thousand, seven hundred seventeen".