165890263 has 8 divisors (see below), whose sum is σ = 206824320. Its totient is φ = 129265080.

The previous prime is 165890251. The next prime is 165890297. The reversal of 165890263 is 362098561.

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

It is a de Polignac number, because none of the positive numbers 2^k-165890263 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 (165890363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1077133 + ... + 1077286.

It is an arithmetic number, because the mean of its divisors is an integer number (25853040).

Almost surely, 2^165890263 is an apocalyptic number.

165890263 is a deficient number, since it is larger than the sum of its proper divisors (40934057).

165890263 is a wasteful number, since it uses less digits than its factorization.

165890263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154437.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 165890263 is about 12879.8394011727. The cubic root of 165890263 is about 549.4653349562.

The spelling of 165890263 in words is "one hundred sixty-five million, eight hundred ninety thousand, two hundred sixty-three".