165393643 has 4 divisors (see below), whose sum is σ = 165444040. Its totient is φ = 165343248.

The previous prime is 165393623. The next prime is 165393659. The reversal of 165393643 is 346393561.

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 165393643 - 2²¹ = 163296491 is a prime.

It is a super-2 number, since 2×165393643² = 54710114289622898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165393596 and 165393605.

It is not an unprimeable number, because it can be changed into a prime (165393623) 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, 19905 + ... + 26962.

It is an arithmetic number, because the mean of its divisors is an integer number (41361010).

Almost surely, 2^165393643 is an apocalyptic number.

165393643 is a deficient number, since it is larger than the sum of its proper divisors (50397).

165393643 is an equidigital number, since it uses as much as digits as its factorization.

165393643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50396.

The product of its digits is 174960, while the sum is 40.

The square root of 165393643 is about 12860.5459837442. The cubic root of 165393643 is about 548.9164817107.

The spelling of 165393643 in words is "one hundred sixty-five million, three hundred ninety-three thousand, six hundred forty-three".