165643233 has 8 divisors (see below), whose sum is σ = 252408768. Its totient is φ = 94653264.

The previous prime is 165643201. The next prime is 165643237. The reversal of 165643233 is 332346561.

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

It is not a de Polignac number, because 165643233 - 2⁵ = 165643201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165643194 and 165643203.

It is not an unprimeable number, because it can be changed into a prime (165643237) 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, 3943866 + ... + 3943907.

It is an arithmetic number, because the mean of its divisors is an integer number (31551096).

Almost surely, 2^165643233 is an apocalyptic number.

It is an amenable number.

165643233 is a deficient number, since it is larger than the sum of its proper divisors (86765535).

165643233 is an equidigital number, since it uses as much as digits as its factorization.

165643233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7887783.

The product of its digits is 38880, while the sum is 33.

The square root of 165643233 is about 12870.2460349443. The cubic root of 165643233 is about 549.1924600853.

Adding to 165643233 its reverse (332346561), we get a palindrome (497989794).

The spelling of 165643233 in words is "one hundred sixty-five million, six hundred forty-three thousand, two hundred thirty-three".