165403643 has 8 divisors (see below), whose sum is σ = 167731200. Its totient is φ = 163082088.

The previous prime is 165403627. The next prime is 165403663. The reversal of 165403643 is 346304561.

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 165403643 - 2⁴ = 165403627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165403663) 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, 98630 + ... + 100292.

It is an arithmetic number, because the mean of its divisors is an integer number (20966400).

Almost surely, 2^165403643 is an apocalyptic number.

165403643 is a deficient number, since it is larger than the sum of its proper divisors (2327557).

165403643 is a wasteful number, since it uses less digits than its factorization.

165403643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 165403643 is about 12860.9347638498. The cubic root of 165403643 is about 548.9275443168.

The spelling of 165403643 in words is "one hundred sixty-five million, four hundred three thousand, six hundred forty-three".