165015959 has 4 divisors (see below), whose sum is σ = 165724416. Its totient is φ = 164307504.

The previous prime is 165015947. The next prime is 165015997. The reversal of 165015959 is 959510561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959510561 = 1013 ⋅947197.

It is a cyclic number.

It is not a de Polignac number, because 165015959 - 2²⁰ = 163967383 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 (165015559) 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 3 ways as a sum of consecutive naturals, for example, 353879 + ... + 354344.

It is an arithmetic number, because the mean of its divisors is an integer number (41431104).

Almost surely, 2^165015959 is an apocalyptic number.

165015959 is a deficient number, since it is larger than the sum of its proper divisors (708457).

165015959 is an equidigital number, since it uses as much as digits as its factorization.

165015959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708456.

The product of its (nonzero) digits is 60750, while the sum is 41.

The square root of 165015959 is about 12845.8537668775. The cubic root of 165015959 is about 548.4983379111.

The spelling of 165015959 in words is "one hundred sixty-five million, fifteen thousand, nine hundred fifty-nine".