165220535 has 16 divisors (see below), whose sum is σ = 212810976. Its totient is φ = 122692608.

The previous prime is 165220507. The next prime is 165220537. The reversal of 165220535 is 535022561.

It is a happy number.

165220535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165220535 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165220498 and 165220507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165220537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7109 + ... + 19518.

It is an arithmetic number, because the mean of its divisors is an integer number (13300686).

Almost surely, 2^165220535 is an apocalyptic number.

165220535 is a deficient number, since it is larger than the sum of its proper divisors (47590441).

165220535 is a wasteful number, since it uses less digits than its factorization.

165220535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26722.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 165220535 is about 12853.8140254167. The cubic root of 165220535 is about 548.7249084370.

The spelling of 165220535 in words is "one hundred sixty-five million, two hundred twenty thousand, five hundred thirty-five".