66180065 has 16 divisors (see below), whose sum is σ = 96100992. Its totient is φ = 42710784.

The previous prime is 66180061. The next prime is 66180073. The reversal of 66180065 is 56008166.

It is a cyclic number.

It is not a de Polignac number, because 66180065 - 2² = 66180061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66180061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55019 + ... + 56208.

It is an arithmetic number, because the mean of its divisors is an integer number (6006312).

Almost surely, 2^66180065 is an apocalyptic number.

It is an amenable number.

66180065 is a deficient number, since it is larger than the sum of its proper divisors (29920927).

66180065 is a wasteful number, since it uses less digits than its factorization.

66180065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111256.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 66180065 is about 8135.1130907935. The cubic root of 66180065 is about 404.4911864632.

The spelling of 66180065 in words is "sixty-six million, one hundred eighty thousand, sixty-five".