913891866865 has 4 divisors (see below), whose sum is σ = 1096670240244. Its totient is φ = 731113493488.

The previous prime is 913891866829. The next prime is 913891866907. The reversal of 913891866865 is 568668198319.

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 110934292624 + 802957574241 = 333068^2 + 896079^2 .

It is a cyclic number.

It is not a de Polignac number, because 913891866865 - 2¹³ = 913891858673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 913891866794 and 913891866803.

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, 91389186682 + ... + 91389186691.

It is an arithmetic number, because the mean of its divisors is an integer number (274167560061).

Almost surely, 2^913891866865 is an apocalyptic number.

It is an amenable number.

913891866865 is a deficient number, since it is larger than the sum of its proper divisors (182778373379).

913891866865 is a wasteful number, since it uses less digits than its factorization.

913891866865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182778373378.

The product of its digits is 134369280, while the sum is 70.

The spelling of 913891866865 in words is "nine hundred thirteen billion, eight hundred ninety-one million, eight hundred sixty-six thousand, eight hundred sixty-five".