165157605 has 12 divisors (see below), whose sum is σ = 286273260. Its totient is φ = 88084032.

The previous prime is 165157583. The next prime is 165157607. The reversal of 165157605 is 506751561.

165157605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 107184609 + 57972996 = 10353^2 + 7614^2 .

It is not a de Polignac number, because 165157605 - 2⁷ = 165157477 is a prime.

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 165157605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165157607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1835040 + ... + 1835129.

It is an arithmetic number, because the mean of its divisors is an integer number (23856105).

Almost surely, 2^165157605 is an apocalyptic number.

165157605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165157605 is a deficient number, since it is larger than the sum of its proper divisors (121115655).

165157605 is a wasteful number, since it uses less digits than its factorization.

165157605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670180 (or 3670177 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 165157605 is about 12851.3658807148. The cubic root of 165157605 is about 548.6552325872.

The spelling of 165157605 in words is "one hundred sixty-five million, one hundred fifty-seven thousand, six hundred five".