165428643 has 8 divisors (see below), whose sum is σ = 220640256. Its totient is φ = 110251400.

The previous prime is 165428633. The next prime is 165428657. The reversal of 165428643 is 346824561.

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 165428643 - 2¹² = 165424547 is a prime.

It is a super-3 number, since 3×165428643³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (165428623) 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, 6358 + ... + 19268.

It is an arithmetic number, because the mean of its divisors is an integer number (27580032).

Almost surely, 2^165428643 is an apocalyptic number.

165428643 is a deficient number, since it is larger than the sum of its proper divisors (55211613).

165428643 is a wasteful number, since it uses less digits than its factorization.

165428643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17185.

The product of its digits is 138240, while the sum is 39.

The square root of 165428643 is about 12861.9066626997. The cubic root of 165428643 is about 548.9551988816.

The spelling of 165428643 in words is "one hundred sixty-five million, four hundred twenty-eight thousand, six hundred forty-three".