165506051 has 4 divisors (see below), whose sum is σ = 165656400. Its totient is φ = 165355704.

The previous prime is 165506039. The next prime is 165506057. The reversal of 165506051 is 150605561.

165506051 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.

It is a cyclic number.

It is not a de Polignac number, because 165506051 - 2²² = 161311747 is a prime.

It is a super-2 number, since 2×165506051² = 54784505835229202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165506057) 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, 73511 + ... + 75728.

It is an arithmetic number, because the mean of its divisors is an integer number (41414100).

Almost surely, 2^165506051 is an apocalyptic number.

165506051 is a deficient number, since it is larger than the sum of its proper divisors (150349).

165506051 is a wasteful number, since it uses less digits than its factorization.

165506051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150348.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 165506051 is about 12864.9155069126. The cubic root of 165506051 is about 549.0408085984.

The spelling of 165506051 in words is "one hundred sixty-five million, five hundred six thousand, fifty-one".