165564553 has 32 divisors (see below), whose sum is σ = 212486400. Its totient is φ = 125280000.

The previous prime is 165564551. The next prime is 165564563. The reversal of 165564553 is 355465561.

It is a cyclic number.

It is not a de Polignac number, because 165564553 - 2¹ = 165564551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165564551) 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 in 31 ways as a sum of consecutive naturals, for example, 474223 + ... + 474571.

It is an arithmetic number, because the mean of its divisors is an integer number (6640200).

Almost surely, 2^165564553 is an apocalyptic number.

It is an amenable number.

165564553 is a deficient number, since it is larger than the sum of its proper divisors (46921847).

165564553 is a wasteful number, since it uses less digits than its factorization.

165564553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529.

The product of its digits is 270000, while the sum is 40.

The square root of 165564553 is about 12867.1890092592. The cubic root of 165564553 is about 549.1054914331.

The spelling of 165564553 in words is "one hundred sixty-five million, five hundred sixty-four thousand, five hundred fifty-three".