165570553 has 2 divisors, whose sum is σ = 165570554. Its totient is φ = 165570552.

The previous prime is 165570551. The next prime is 165570557. The reversal of 165570553 is 355075561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122168809 + 43401744 = 11053^2 + 6588^2 .

It is a cyclic number.

It is not a de Polignac number, because 165570553 - 2¹ = 165570551 is a prime.

Together with 165570551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165570551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82785276 + 82785277.

It is an arithmetic number, because the mean of its divisors is an integer number (82785277).

Almost surely, 2^165570553 is an apocalyptic number.

It is an amenable number.

165570553 is a deficient number, since it is larger than the sum of its proper divisors (1).

165570553 is an equidigital number, since it uses as much as digits as its factorization.

165570553 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 165570553 is about 12867.4221583035. The cubic root of 165570553 is about 549.1121244816.

The spelling of 165570553 in words is "one hundred sixty-five million, five hundred seventy thousand, five hundred fifty-three".