166535565 has 48 divisors (see below), whose sum is σ = 320002560. Its totient is φ = 73664640.

The previous prime is 166535539. The next prime is 166535569. The reversal of 166535565 is 565535661.

166535565 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 166535565 - 2⁵ = 166535533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166535569) 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, 19131 + ... + 26439.

It is an arithmetic number, because the mean of its divisors is an integer number (6666720).

Almost surely, 2^166535565 is an apocalyptic number.

166535565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166535565 is a deficient number, since it is larger than the sum of its proper divisors (153466995).

166535565 is a wasteful number, since it uses less digits than its factorization.

166535565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362 (or 7355 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The square root of 166535565 is about 12904.8659427365. The cubic root of 166535565 is about 550.1768742425.

The spelling of 166535565 in words is "one hundred sixty-six million, five hundred thirty-five thousand, five hundred sixty-five".