165566610 has 96 divisors (see below), whose sum is σ = 481178880. Its totient is φ = 39148800.

The previous prime is 165566591. The next prime is 165566623. The reversal of 165566610 is 16665561.

165566610 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38551 + ... + 42629.

It is an arithmetic number, because the mean of its divisors is an integer number (5012280).

Almost surely, 2^165566610 is an apocalyptic number.

165566610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165566610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240589440).

165566610 is an abundant number, since it is smaller than the sum of its proper divisors (315612270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165566610 is a wasteful number, since it uses less digits than its factorization.

165566610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144 (or 4141 counting only the distinct ones).

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

The square root of 165566610 is about 12867.2689409991. The cubic root of 165566610 is about 549.1077654813.

It can be divided in two parts, 165566 and 610, that added together give a triangular number (166176 = T₅₇₆).

The spelling of 165566610 in words is "one hundred sixty-five million, five hundred sixty-six thousand, six hundred ten".