66105165 has 24 divisors (see below), whose sum is σ = 123037920. Its totient is φ = 30219168.

The previous prime is 66105157. The next prime is 66105167. The reversal of 66105165 is 56150166.

It is not a de Polignac number, because 66105165 - 2³ = 66105157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66105167) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44235 + ... + 45704.

It is an arithmetic number, because the mean of its divisors is an integer number (5126580).

Almost surely, 2^66105165 is an apocalyptic number.

It is an amenable number.

66105165 is a deficient number, since it is larger than the sum of its proper divisors (56932755).

66105165 is a wasteful number, since it uses less digits than its factorization.

66105165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89961 (or 89954 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66105165 is about 8130.5082866940. The cubic root of 66105165 is about 404.3385331102.

The spelling of 66105165 in words is "sixty-six million, one hundred five thousand, one hundred sixty-five".