165412261 has 8 divisors (see below), whose sum is σ = 200162880. Its totient is φ = 133441728.

The previous prime is 165412243. The next prime is 165412267. The reversal of 165412261 is 162214561.

165412261 = 1964² + 1965² + ... + 2005².

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

It is not a de Polignac number, because 165412261 - 2⁷ = 165412133 is a prime.

It is a super-2 number, since 2×165412261² = 54722432178264242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165412267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694891 + ... + 695128.

It is an arithmetic number, because the mean of its divisors is an integer number (25020360).

Almost surely, 2^165412261 is an apocalyptic number.

It is an amenable number.

165412261 is a deficient number, since it is larger than the sum of its proper divisors (34750619).

165412261 is a wasteful number, since it uses less digits than its factorization.

165412261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390043.

The product of its digits is 2880, while the sum is 28.

The square root of 165412261 is about 12861.2698051164. The cubic root of 165412261 is about 548.9370777131.

The spelling of 165412261 in words is "one hundred sixty-five million, four hundred twelve thousand, two hundred sixty-one".