166565616 has 160 divisors (see below), whose sum is σ = 512967168. Its totient is φ = 45588480.

The previous prime is 166565599. The next prime is 166565627. The reversal of 166565616 is 616565661.

166565616 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1473976 + ... + 1474088.

Almost surely, 2^166565616 is an apocalyptic number.

166565616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166565616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256483584).

166565616 is an abundant number, since it is smaller than the sum of its proper divisors (346401552).

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

166565616 is a wasteful number, since it uses less digits than its factorization.

166565616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 273 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 166565616 is about 12906.0302184676. The cubic root of 166565616 is about 550.2099650138.

The spelling of 166565616 in words is "one hundred sixty-six million, five hundred sixty-five thousand, six hundred sixteen".