66195065 has 8 divisors (see below), whose sum is σ = 80736648. Its totient is φ = 52087680.

The previous prime is 66195053. The next prime is 66195071. The reversal of 66195065 is 56059166.

It can be written as a sum of positive squares in 4 ways, for example, as 4541161 + 61653904 = 2131^2 + 7852^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66195065 - 2⁴ = 66195049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108212 + ... + 108821.

It is an arithmetic number, because the mean of its divisors is an integer number (10092081).

Almost surely, 2^66195065 is an apocalyptic number.

It is an amenable number.

66195065 is a deficient number, since it is larger than the sum of its proper divisors (14541583).

66195065 is a wasteful number, since it uses less digits than its factorization.

66195065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217099.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 66195065 is about 8136.0349679681. The cubic root of 66195065 is about 404.5217440511.

The spelling of 66195065 in words is "sixty-six million, one hundred ninety-five thousand, sixty-five".