165161887 has 4 divisors (see below), whose sum is σ = 180176616. Its totient is φ = 150147160.

The previous prime is 165161863. The next prime is 165161891. The reversal of 165161887 is 788161561.

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 165161887 - 2¹⁵ = 165129119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165161687) 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, 7507348 + ... + 7507369.

It is an arithmetic number, because the mean of its divisors is an integer number (45044154).

Almost surely, 2^165161887 is an apocalyptic number.

165161887 is a deficient number, since it is larger than the sum of its proper divisors (15014729).

165161887 is a wasteful number, since it uses less digits than its factorization.

165161887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15014728.

The product of its digits is 80640, while the sum is 43.

The square root of 165161887 is about 12851.5324767127. The cubic root of 165161887 is about 548.6599741620.

The spelling of 165161887 in words is "one hundred sixty-five million, one hundred sixty-one thousand, eight hundred eighty-seven".