163533553 has 2 divisors, whose sum is σ = 163533554. Its totient is φ = 163533552.

The previous prime is 163533541. The next prime is 163533563. The reversal of 163533553 is 355335361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134026929 + 29506624 = 11577^2 + 5432^2 .

It is a cyclic number.

It is not a de Polignac number, because 163533553 - 2⁵ = 163533521 is a prime.

It is not a weakly prime, because it can be changed into another prime (163533563) 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, 81766776 + 81766777.

It is an arithmetic number, because the mean of its divisors is an integer number (81766777).

Almost surely, 2^163533553 is an apocalyptic number.

It is an amenable number.

163533553 is a deficient number, since it is larger than the sum of its proper divisors (1).

163533553 is an equidigital number, since it uses as much as digits as its factorization.

163533553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 34.

The square root of 163533553 is about 12788.0238113635. The cubic root of 163533553 is about 546.8509331145.

The spelling of 163533553 in words is "one hundred sixty-three million, five hundred thirty-three thousand, five hundred fifty-three".