66165165 has 48 divisors (see below), whose sum is σ = 125798400. Its totient is φ = 31904640.

The previous prime is 66165149. The next prime is 66165217. The reversal of 66165165 is 56156166.

It is not a de Polignac number, because 66165165 - 2⁴ = 66165149 is a prime.

It is a congruent number.

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, 172564 + ... + 172946.

It is an arithmetic number, because the mean of its divisors is an integer number (2620800).

Almost surely, 2^66165165 is an apocalyptic number.

It is an amenable number.

66165165 is a deficient number, since it is larger than the sum of its proper divisors (59633235).

66165165 is a wasteful number, since it uses less digits than its factorization.

66165165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 751 counting only the distinct ones).

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

The square root of 66165165 is about 8134.1972560296. The cubic root of 66165165 is about 404.4608280210.

It can be divided in two parts, 6616 and 5165, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 66165165 in words is "sixty-six million, one hundred sixty-five thousand, one hundred sixty-five".