165145563 has 12 divisors (see below), whose sum is σ = 260229528. Its totient is φ = 100088160.

The previous prime is 165145537. The next prime is 165145567. The reversal of 165145563 is 365541561.

165145563 is a `hidden beast` number, since 1 + 6 + 51 + 45 + 563 = 666.

It is not a de Polignac number, because 165145563 - 2¹⁷ = 165014491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165145567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 833970 + ... + 834167.

It is an arithmetic number, because the mean of its divisors is an integer number (21685794).

Almost surely, 2^165145563 is an apocalyptic number.

165145563 is a deficient number, since it is larger than the sum of its proper divisors (95083965).

165145563 is a wasteful number, since it uses less digits than its factorization.

165145563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668154 (or 1668151 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 165145563 is about 12850.8973616631. The cubic root of 165145563 is about 548.6418977145.

The spelling of 165145563 in words is "one hundred sixty-five million, one hundred forty-five thousand, five hundred sixty-three".