165155563 has 4 divisors (see below), whose sum is σ = 165217288. Its totient is φ = 165093840.

The previous prime is 165155539. The next prime is 165155567. The reversal of 165155563 is 365551561.

165155563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365551561 = 17 ⋅21503033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165155563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165155567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26658 + ... + 32263.

It is an arithmetic number, because the mean of its divisors is an integer number (41304322).

Almost surely, 2^165155563 is an apocalyptic number.

165155563 is a deficient number, since it is larger than the sum of its proper divisors (61725).

165155563 is an equidigital number, since it uses as much as digits as its factorization.

165155563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61724.

The product of its digits is 67500, while the sum is 37.

The square root of 165155563 is about 12851.2864336610. The cubic root of 165155563 is about 548.6529713963.

The spelling of 165155563 in words is "one hundred sixty-five million, one hundred fifty-five thousand, five hundred sixty-three".