165646653 has 4 divisors (see below), whose sum is σ = 220862208. Its totient is φ = 110431100.

The previous prime is 165646643. The next prime is 165646673. The reversal of 165646653 is 356646561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165646653 - 2¹⁸ = 165384509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165646603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27607773 + ... + 27607778.

It is an arithmetic number, because the mean of its divisors is an integer number (55215552).

Almost surely, 2^165646653 is an apocalyptic number.

It is an amenable number.

165646653 is a deficient number, since it is larger than the sum of its proper divisors (55215555).

165646653 is an equidigital number, since it uses as much as digits as its factorization.

165646653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55215554.

The product of its digits is 388800, while the sum is 42.

The square root of 165646653 is about 12870.3788988514. The cubic root of 165646653 is about 549.1962397453.

The spelling of 165646653 in words is "one hundred sixty-five million, six hundred forty-six thousand, six hundred fifty-three".