165041691 has 4 divisors (see below), whose sum is σ = 220055592. Its totient is φ = 110027792.

The previous prime is 165041677. The next prime is 165041731. The reversal of 165041691 is 196140561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165041691 - 2⁷ = 165041563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165041621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27506946 + ... + 27506951.

It is an arithmetic number, because the mean of its divisors is an integer number (55013898).

Almost surely, 2^165041691 is an apocalyptic number.

165041691 is a deficient number, since it is larger than the sum of its proper divisors (55013901).

165041691 is an equidigital number, since it uses as much as digits as its factorization.

165041691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55013900.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 165041691 is about 12846.8552961415. The cubic root of 165041691 is about 548.5268467207.

The spelling of 165041691 in words is "one hundred sixty-five million, forty-one thousand, six hundred ninety-one".