163505557 has 2 divisors, whose sum is σ = 163505558. Its totient is φ = 163505556.

The previous prime is 163505543. The next prime is 163505591. The reversal of 163505557 is 755505361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110376036 + 53129521 = 10506^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 163505557 - 2⁷ = 163505429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163505357) 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, 81752778 + 81752779.

It is an arithmetic number, because the mean of its divisors is an integer number (81752779).

Almost surely, 2^163505557 is an apocalyptic number.

It is an amenable number.

163505557 is a deficient number, since it is larger than the sum of its proper divisors (1).

163505557 is an equidigital number, since it uses as much as digits as its factorization.

163505557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78750, while the sum is 37.

The square root of 163505557 is about 12786.9291465934. The cubic root of 163505557 is about 546.8197254262.

The spelling of 163505557 in words is "one hundred sixty-three million, five hundred five thousand, five hundred fifty-seven".