165425069853 has 20 divisors (see below), whose sum is σ = 247133249308. Its totient is φ = 110275888320.

The previous prime is 165425069809. The next prime is 165425069857. The reversal of 165425069853 is 358960524561.

165425069853 is a `hidden beast` number, since 1 + 6 + 5 + 42 + 506 + 98 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 121175002404 + 44250067449 = 348102^2 + 210357^2 .

It is not a de Polignac number, because 165425069853 - 2¹⁶ = 165425004317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165425069853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165425069857) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1295025 + ... + 1417017.

Almost surely, 2^165425069853 is an apocalyptic number.

It is an amenable number.

165425069853 is a deficient number, since it is larger than the sum of its proper divisors (81708179455).

165425069853 is a wasteful number, since it uses less digits than its factorization.

165425069853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138746 (or 138737 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 54.

The spelling of 165425069853 in words is "one hundred sixty-five billion, four hundred twenty-five million, sixty-nine thousand, eight hundred fifty-three".