165861266 has 8 divisors (see below), whose sum is σ = 257371020. Its totient is φ = 80070928.

The previous prime is 165861259. The next prime is 165861271. The reversal of 165861266 is 662168561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 141110641 + 24750625 = 11879^2 + 4975^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429781 + ... + 1429896.

Almost surely, 2^165861266 is an apocalyptic number.

165861266 is a deficient number, since it is larger than the sum of its proper divisors (91509754).

165861266 is a wasteful number, since it uses less digits than its factorization.

165861266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859708.

The product of its digits is 103680, while the sum is 41.

The square root of 165861266 is about 12878.7136780037. The cubic root of 165861266 is about 549.4333182595.

The spelling of 165861266 in words is "one hundred sixty-five million, eight hundred sixty-one thousand, two hundred sixty-six".