165613566 has 32 divisors (see below), whose sum is σ = 335301120. Its totient is φ = 54530336.

The previous prime is 165613559. The next prime is 165613573. The reversal of 165613566 is 665316561.

165613566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165613559) and next prime (165613573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196975 + ... + 197813.

It is an arithmetic number, because the mean of its divisors is an integer number (10478160).

Almost surely, 2^165613566 is an apocalyptic number.

165613566 is an abundant number, since it is smaller than the sum of its proper divisors (169687554).

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

165613566 is a wasteful number, since it uses less digits than its factorization.

165613566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

The product of its digits is 97200, while the sum is 39.

The square root of 165613566 is about 12869.0934412646. The cubic root of 165613566 is about 549.1596710097.

The spelling of 165613566 in words is "one hundred sixty-five million, six hundred thirteen thousand, five hundred sixty-six".