165115405 has 64 divisors (see below), whose sum is σ = 256048128. Its totient is φ = 99440640.

The previous prime is 165115387. The next prime is 165115417. The reversal of 165115405 is 504511561.

It is a happy number.

It is not a de Polignac number, because 165115405 - 2²³ = 156726797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 988632 + ... + 988798.

It is an arithmetic number, because the mean of its divisors is an integer number (4000752).

Almost surely, 2^165115405 is an apocalyptic number.

It is an amenable number.

165115405 is a deficient number, since it is larger than the sum of its proper divisors (90932723).

165115405 is a wasteful number, since it uses less digits than its factorization.

165115405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 165115405 is about 12849.7239269955. The cubic root of 165115405 is about 548.6084989978.

Adding to 165115405 its reverse (504511561), we get a palindrome (669626966).

The spelling of 165115405 in words is "one hundred sixty-five million, one hundred fifteen thousand, four hundred five".