165320553 has 8 divisors (see below), whose sum is σ = 224041216. Its totient is φ = 108406800.

The previous prime is 165320543. The next prime is 165320579. The reversal of 165320553 is 355023561.

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

It is not a de Polignac number, because 165320553 - 2¹⁸ = 165058409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165320553.

It is not an unprimeable number, because it can be changed into a prime (165320543) 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, 451513 + ... + 451878.

It is an arithmetic number, because the mean of its divisors is an integer number (28005152).

Almost surely, 2^165320553 is an apocalyptic number.

It is an amenable number.

165320553 is a deficient number, since it is larger than the sum of its proper divisors (58720663).

165320553 is an equidigital number, since it uses as much as digits as its factorization.

165320553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903455.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 165320553 is about 12857.7040329913. The cubic root of 165320553 is about 548.8356115791.

The spelling of 165320553 in words is "one hundred sixty-five million, three hundred twenty thousand, five hundred fifty-three".