865718990377 has 4 divisors (see below), whose sum is σ = 868199560900. Its totient is φ = 863238419856.

The previous prime is 865718990351. The next prime is 865718990401. The reversal of 865718990377 is 773099817568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280281301056 + 585437689321 = 529416^2 + 765139^2 .

It is a cyclic number.

It is not a de Polignac number, because 865718990377 - 2¹⁹ = 865718466089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865718990327) 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, 1240284738 + ... + 1240285435.

It is an arithmetic number, because the mean of its divisors is an integer number (217049890225).

Almost surely, 2^865718990377 is an apocalyptic number.

It is an amenable number.

865718990377 is a deficient number, since it is larger than the sum of its proper divisors (2480570523).

865718990377 is a wasteful number, since it uses less digits than its factorization.

865718990377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480570522.

The product of its (nonzero) digits is 160030080, while the sum is 70.

The spelling of 865718990377 in words is "eight hundred sixty-five billion, seven hundred eighteen million, nine hundred ninety thousand, three hundred seventy-seven".