865791448921 has 8 divisors (see below), whose sum is σ = 1023595801920. Its totient is φ = 716517061008.

The previous prime is 865791448919. The next prime is 865791448931. The reversal of 865791448921 is 129844197568.

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

It is not a de Polignac number, because 865791448921 - 2¹ = 865791448919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865791448931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2132491051 + ... + 2132491456.

It is an arithmetic number, because the mean of its divisors is an integer number (127949475240).

Almost surely, 2^865791448921 is an apocalyptic number.

It is an amenable number.

865791448921 is a deficient number, since it is larger than the sum of its proper divisors (157804352999).

865791448921 is a wasteful number, since it uses less digits than its factorization.

865791448921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264982543.

The product of its digits is 34836480, while the sum is 64.

The spelling of 865791448921 in words is "eight hundred sixty-five billion, seven hundred ninety-one million, four hundred forty-eight thousand, nine hundred twenty-one".