165840791 has 8 divisors (see below), whose sum is σ = 167454720. Its totient is φ = 164231928.

The previous prime is 165840781. The next prime is 165840823. The reversal of 165840791 is 197048561.

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

It is a cyclic number.

It is not a de Polignac number, because 165840791 - 2¹⁰ = 165839767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165840781) 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, 104240 + ... + 105818.

It is an arithmetic number, because the mean of its divisors is an integer number (20931840).

Almost surely, 2^165840791 is an apocalyptic number.

165840791 is a deficient number, since it is larger than the sum of its proper divisors (1613929).

165840791 is a wasteful number, since it uses less digits than its factorization.

165840791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 165840791 is about 12877.9187371252. The cubic root of 165840791 is about 549.4107087811.

The spelling of 165840791 in words is "one hundred sixty-five million, eight hundred forty thousand, seven hundred ninety-one".