165056563 has 4 divisors (see below), whose sum is σ = 188636080. Its totient is φ = 141477048.

The previous prime is 165056561. The next prime is 165056581. The reversal of 165056563 is 365650561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165056563 - 2¹ = 165056561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165056561) 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 3 ways as a sum of consecutive naturals, for example, 11789748 + ... + 11789761.

It is an arithmetic number, because the mean of its divisors is an integer number (47159020).

Almost surely, 2^165056563 is an apocalyptic number.

165056563 is a deficient number, since it is larger than the sum of its proper divisors (23579517).

165056563 is an equidigital number, since it uses as much as digits as its factorization.

165056563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23579516.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 165056563 is about 12847.4341017964. The cubic root of 165056563 is about 548.5433222472.

The spelling of 165056563 in words is "one hundred sixty-five million, fifty-six thousand, five hundred sixty-three".