165909894146 has 16 divisors (see below), whose sum is σ = 266464672920. Its totient is φ = 77197992960.

The previous prime is 165909894107. The next prime is 165909894149. The reversal of 165909894146 is 641498909561.

It can be written as a sum of positive squares in 4 ways, for example, as 165436614121 + 473280025 = 406739^2 + 21755^2 .

It is not an unprimeable number, because it can be changed into a prime (165909894149) 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, 27411035 + ... + 27417086.

Almost surely, 2^165909894146 is an apocalyptic number.

165909894146 is a deficient number, since it is larger than the sum of its proper divisors (100554778774).

165909894146 is a wasteful number, since it uses less digits than its factorization.

165909894146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54828229.

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 165909894146 in words is "one hundred sixty-five billion, nine hundred nine million, eight hundred ninety-four thousand, one hundred forty-six".