165961269 has 6 divisors (see below), whose sum is σ = 239721846. Its totient is φ = 110640840.

The previous prime is 165961267. The next prime is 165961273. The reversal of 165961269 is 962169561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 102758769 + 63202500 = 10137^2 + 7950^2 .

It is not a de Polignac number, because 165961269 - 2¹ = 165961267 is a prime.

It is a super-2 number, since 2×165961269² = 55086285616180722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165961267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9220062 + ... + 9220079.

It is an arithmetic number, because the mean of its divisors is an integer number (39953641).

Almost surely, 2^165961269 is an apocalyptic number.

It is an amenable number.

165961269 is a deficient number, since it is larger than the sum of its proper divisors (73760577).

165961269 is a wasteful number, since it uses less digits than its factorization.

165961269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18440147 (or 18440144 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 165961269 is about 12882.5955847415. The cubic root of 165961269 is about 549.5437196458.

The spelling of 165961269 in words is "one hundred sixty-five million, nine hundred sixty-one thousand, two hundred sixty-nine".