165964159 has 8 divisors (see below), whose sum is σ = 175766400. Its totient is φ = 156377496.

The previous prime is 165964153. The next prime is 165964171. The reversal of 165964159 is 951469561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165964159 - 2¹⁵ = 165931391 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 (165964153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52309 + ... + 55390.

It is an arithmetic number, because the mean of its divisors is an integer number (21970800).

Almost surely, 2^165964159 is an apocalyptic number.

165964159 is a deficient number, since it is larger than the sum of its proper divisors (9802241).

165964159 is a wasteful number, since it uses less digits than its factorization.

165964159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107789.

The product of its digits is 291600, while the sum is 46.

The square root of 165964159 is about 12882.7077510902. The cubic root of 165964159 is about 549.5469094907.

It can be divided in two parts, 165 and 964159, that added together give a square (964324 = 982²).

The spelling of 165964159 in words is "one hundred sixty-five million, nine hundred sixty-four thousand, one hundred fifty-nine".