165264643 has 4 divisors (see below), whose sum is σ = 168780960. Its totient is φ = 161748328.

The previous prime is 165264629. The next prime is 165264661. The reversal of 165264643 is 346462561.

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 165264643 - 2⁵ = 165264611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165264613) 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, 1758088 + ... + 1758181.

It is an arithmetic number, because the mean of its divisors is an integer number (42195240).

Almost surely, 2^165264643 is an apocalyptic number.

165264643 is a deficient number, since it is larger than the sum of its proper divisors (3516317).

165264643 is an equidigital number, since it uses as much as digits as its factorization.

165264643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516316.

The product of its digits is 103680, while the sum is 37.

The square root of 165264643 is about 12855.5296662565. The cubic root of 165264643 is about 548.7737340966.

The spelling of 165264643 in words is "one hundred sixty-five million, two hundred sixty-four thousand, six hundred forty-three".