165611073325 has 18 divisors (see below), whose sum is σ = 206727433962. Its totient is φ = 131610996000.

The previous prime is 165611073211. The next prime is 165611073403. The reversal of 165611073325 is 523370116561.

It can be written as a sum of positive squares in 3 ways, for example, as 50078383524 + 115532689801 = 223782^2 + 339901^2 .

It is not a de Polignac number, because 165611073325 - 2⁷ = 165611073197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 424759 + ... + 715291.

Almost surely, 2^165611073325 is an apocalyptic number.

It is an amenable number.

165611073325 is a deficient number, since it is larger than the sum of its proper divisors (41116360637).

165611073325 is an equidigital number, since it uses as much as digits as its factorization.

165611073325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290845 (or 290689 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

Adding to 165611073325 its reverse (523370116561), we get a palindrome (688981189886).

The spelling of 165611073325 in words is "one hundred sixty-five billion, six hundred eleven million, seventy-three thousand, three hundred twenty-five".