165610665 has 48 divisors (see below), whose sum is σ = 315297216. Its totient is φ = 79747200.

The previous prime is 165610663. The next prime is 165610691. The reversal of 165610665 is 566016561.

165610665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165610665 - 2¹ = 165610663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165610661) 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, 76650 + ... + 78780.

It is an arithmetic number, because the mean of its divisors is an integer number (6568692).

Almost surely, 2^165610665 is an apocalyptic number.

165610665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165610665 is a deficient number, since it is larger than the sum of its proper divisors (149686551).

165610665 is a wasteful number, since it uses less digits than its factorization.

165610665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 165610665 is about 12868.9807288689. The cubic root of 165610665 is about 549.1564645060.

It can be divided in two parts, 1656 and 10665, that added together give a palindrome (12321).

The spelling of 165610665 in words is "one hundred sixty-five million, six hundred ten thousand, six hundred sixty-five".