66100165 has 16 divisors (see below), whose sum is σ = 84862512. Its totient is φ = 49250304.

The previous prime is 66100117. The next prime is 66100187. The reversal of 66100165 is 56100166.

It can be written as a sum of positive squares in 8 ways, for example, as 538756 + 65561409 = 734^2 + 8097^2 .

It is a cyclic number.

It is not a de Polignac number, because 66100165 - 2⁷ = 66100037 is a prime.

It is a Duffinian number.

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, 4237 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (5303907).

Almost surely, 2^66100165 is an apocalyptic number.

It is an amenable number.

66100165 is a deficient number, since it is larger than the sum of its proper divisors (18762347).

66100165 is a wasteful number, since it uses less digits than its factorization.

66100165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8136.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66100165 is about 8130.2007970283. The cubic root of 66100165 is about 404.3283385279.

Subtracting from 66100165 its reverse (56100166), we obtain a palindrome (9999999).

The spelling of 66100165 in words is "sixty-six million, one hundred thousand, one hundred sixty-five".