7894971065 has 4 divisors (see below), whose sum is σ = 9473965284. Its totient is φ = 6315976848.

The previous prime is 7894971041. The next prime is 7894971121. The reversal of 7894971065 is 5601794987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5601794987 = 1699 ⋅3297113.

It can be written as a sum of positive squares in 2 ways, for example, as 5580687616 + 2314283449 = 74704^2 + 48107^2 .

It is a cyclic number.

It is not a de Polignac number, because 7894971065 - 2¹⁴ = 7894954681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7894971065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789497102 + ... + 789497111.

It is an arithmetic number, because the mean of its divisors is an integer number (2368491321).

Almost surely, 2^7894971065 is an apocalyptic number.

It is an amenable number.

7894971065 is a deficient number, since it is larger than the sum of its proper divisors (1578994219).

7894971065 is a wasteful number, since it uses less digits than its factorization.

7894971065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578994218.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 7894971065 is about 88853.6496999420. The cubic root of 7894971065 is about 1991.2090045648.

The spelling of 7894971065 in words is "seven billion, eight hundred ninety-four million, nine hundred seventy-one thousand, sixty-five".