857668435521 has 8 divisors (see below), whose sum is σ = 1146438414144. Its totient is φ = 570338706960.

The previous prime is 857668435511. The next prime is 857668435541. The reversal of 857668435521 is 125534866758.

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

It is not a de Polignac number, because 857668435521 - 2⁶ = 857668435457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (857668435501) 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, 360061125 + ... + 360063506.

It is an arithmetic number, because the mean of its divisors is an integer number (143304801768).

Almost surely, 2^857668435521 is an apocalyptic number.

It is an amenable number.

857668435521 is a deficient number, since it is larger than the sum of its proper divisors (288769978623).

857668435521 is a wasteful number, since it uses less digits than its factorization.

857668435521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720125031.

The product of its digits is 48384000, while the sum is 60.

The spelling of 857668435521 in words is "eight hundred fifty-seven billion, six hundred sixty-eight million, four hundred thirty-five thousand, five hundred twenty-one".