165613525 has 48 divisors (see below), whose sum is σ = 257840640. Its totient is φ = 102513600.

The previous prime is 165613523. The next prime is 165613537. The reversal of 165613525 is 525316561.

It is not a de Polignac number, because 165613525 - 2¹ = 165613523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165613523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 436786 + ... + 437164.

It is an arithmetic number, because the mean of its divisors is an integer number (5371680).

Almost surely, 2^165613525 is an apocalyptic number.

It is an amenable number.

165613525 is a deficient number, since it is larger than the sum of its proper divisors (92227115).

165613525 is a wasteful number, since it uses less digits than its factorization.

165613525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 629 counting only the distinct ones).

The product of its digits is 27000, while the sum is 34.

The square root of 165613525 is about 12869.0918483007. The cubic root of 165613525 is about 549.1596256922.

The spelling of 165613525 in words is "one hundred sixty-five million, six hundred thirteen thousand, five hundred twenty-five".