165091266 has 48 divisors (see below), whose sum is σ = 378275040. Its totient is φ = 51891840.

The previous prime is 165091261. The next prime is 165091271. The reversal of 165091266 is 662190561.

It is an interprime number because it is at equal distance from previous prime (165091261) and next prime (165091271).

It is a super-2 number, since 2×165091266² = 54510252218965512, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165091266.

It is not an unprimeable number, because it can be changed into a prime (165091261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81421 + ... + 83423.

It is an arithmetic number, because the mean of its divisors is an integer number (7880730).

Almost surely, 2^165091266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165091266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189137520).

165091266 is an abundant number, since it is smaller than the sum of its proper divisors (213183774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165091266 is a wasteful number, since it uses less digits than its factorization.

165091266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 165091266 is about 12848.7846117833. The cubic root of 165091266 is about 548.5817631400.

The spelling of 165091266 in words is "one hundred sixty-five million, ninety-one thousand, two hundred sixty-six".