165547421 has 8 divisors (see below), whose sum is σ = 179687424. Its totient is φ = 151608240.

The previous prime is 165547397. The next prime is 165547433. The reversal of 165547421 is 124745561.

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 165547421 - 2⁶ = 165547357 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 (165547021) 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, 48485 + ... + 51786.

It is an arithmetic number, because the mean of its divisors is an integer number (22460928).

Almost surely, 2^165547421 is an apocalyptic number.

It is an amenable number.

165547421 is a deficient number, since it is larger than the sum of its proper divisors (14140003).

165547421 is a wasteful number, since it uses less digits than its factorization.

165547421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100411.

The product of its digits is 33600, while the sum is 35.

The square root of 165547421 is about 12866.5232677674. The cubic root of 165547421 is about 549.0865509864.

The spelling of 165547421 in words is "one hundred sixty-five million, five hundred forty-seven thousand, four hundred twenty-one".