66770065 has 4 divisors (see below), whose sum is σ = 80124084. Its totient is φ = 53416048.

The previous prime is 66770057. The next prime is 66770069. The reversal of 66770065 is 56007766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56007766 = 2 ⋅28003883.

It can be written as a sum of positive squares in 2 ways, for example, as 51955264 + 14814801 = 7208^2 + 3849^2 .

It is a cyclic number.

It is not a de Polignac number, because 66770065 - 2³ = 66770057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66770069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6677002 + ... + 6677011.

It is an arithmetic number, because the mean of its divisors is an integer number (20031021).

Almost surely, 2^66770065 is an apocalyptic number.

It is an amenable number.

66770065 is a deficient number, since it is larger than the sum of its proper divisors (13354019).

66770065 is a wasteful number, since it uses less digits than its factorization.

66770065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354018.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 66770065 is about 8171.2951849753. The cubic root of 66770065 is about 405.6896546044.

The spelling of 66770065 in words is "sixty-six million, seven hundred seventy thousand, sixty-five".