168128557 has 2 divisors, whose sum is σ = 168128558. Its totient is φ = 168128556.

The previous prime is 168128537. The next prime is 168128567. The reversal of 168128557 is 755821861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158231241 + 9897316 = 12579^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 168128557 - 2¹⁵ = 168095789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168128507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84064278 + 84064279.

It is an arithmetic number, because the mean of its divisors is an integer number (84064279).

Almost surely, 2^168128557 is an apocalyptic number.

It is an amenable number.

168128557 is a deficient number, since it is larger than the sum of its proper divisors (1).

168128557 is an equidigital number, since it uses as much as digits as its factorization.

168128557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 43.

The square root of 168128557 is about 12966.4396423999. The cubic root of 168128557 is about 551.9255450320.

The spelling of 168128557 in words is "one hundred sixty-eight million, one hundred twenty-eight thousand, five hundred fifty-seven".