868945425721 has 4 divisors (see below), whose sum is σ = 869044617844. Its totient is φ = 868846233600.

The previous prime is 868945425713. The next prime is 868945425737. The reversal of 868945425721 is 127524549868.

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 317098503225 + 551846922496 = 563115^2 + 742864^2 .

It is a cyclic number.

It is not a de Polignac number, because 868945425721 - 2³ = 868945425713 is a prime.

It is a super-3 number, since 3×868945425721³ (a number of 37 digits) contains 333 as substring.

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 868945425721.

It is not an unprimeable number, because it can be changed into a prime (868945425221) 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, 49582920 + ... + 49600441.

It is an arithmetic number, because the mean of its divisors is an integer number (217261154461).

Almost surely, 2^868945425721 is an apocalyptic number.

It is an amenable number.

868945425721 is a deficient number, since it is larger than the sum of its proper divisors (99192123).

868945425721 is an equidigital number, since it uses as much as digits as its factorization.

868945425721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99192122.

The product of its digits is 38707200, while the sum is 61.

The spelling of 868945425721 in words is "eight hundred sixty-eight billion, nine hundred forty-five million, four hundred twenty-five thousand, seven hundred twenty-one".