163868857 has 2 divisors, whose sum is σ = 163868858. Its totient is φ = 163868856.

The previous prime is 163868839. The next prime is 163868869. The reversal of 163868857 is 758868361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148376761 + 15492096 = 12181^2 + 3936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163868857 is a prime.

It is not a weakly prime, because it can be changed into another prime (163868827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81934428 + 81934429.

It is an arithmetic number, because the mean of its divisors is an integer number (81934429).

Almost surely, 2^163868857 is an apocalyptic number.

It is an amenable number.

163868857 is a deficient number, since it is larger than the sum of its proper divisors (1).

163868857 is an equidigital number, since it uses as much as digits as its factorization.

163868857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 163868857 is about 12801.1271769325. The cubic root of 163868857 is about 547.2244265558.

The spelling of 163868857 in words is "one hundred sixty-three million, eight hundred sixty-eight thousand, eight hundred fifty-seven".