165949791 has 16 divisors (see below), whose sum is σ = 256439808. Its totient is φ = 93492000.

The previous prime is 165949769. The next prime is 165949799. The reversal of 165949791 is 197949561.

It is not a de Polignac number, because 165949791 - 2⁵ = 165949759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165949799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54160 + ... + 57141.

It is an arithmetic number, because the mean of its divisors is an integer number (16027488).

Almost surely, 2^165949791 is an apocalyptic number.

165949791 is a deficient number, since it is larger than the sum of its proper divisors (90490017).

165949791 is a wasteful number, since it uses less digits than its factorization.

165949791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111382.

The product of its digits is 612360, while the sum is 51.

The square root of 165949791 is about 12882.1500922789. The cubic root of 165949791 is about 549.5310504083.

The spelling of 165949791 in words is "one hundred sixty-five million, nine hundred forty-nine thousand, seven hundred ninety-one".