8128227157 has 2 divisors, whose sum is σ = 8128227158. Its totient is φ = 8128227156.

The previous prime is 8128227139. The next prime is 8128227179. The reversal of 8128227157 is 7517228218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4864504516 + 3263722641 = 69746^2 + 57129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8128227157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8128227137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4064113578 + 4064113579.

It is an arithmetic number, because the mean of its divisors is an integer number (4064113579).

Almost surely, 2^8128227157 is an apocalyptic number.

It is an amenable number.

8128227157 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128227157 is an equidigital number, since it uses as much as digits as its factorization.

8128227157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 43.

The square root of 8128227157 is about 90156.6811556415. The cubic root of 8128227157 is about 2010.6290084381.

The spelling of 8128227157 in words is "eight billion, one hundred twenty-eight million, two hundred twenty-seven thousand, one hundred fifty-seven".