857851421008 has 10 divisors (see below), whose sum is σ = 1662087128234. Its totient is φ = 428925710496.

The previous prime is 857851421003. The next prime is 857851421071. The reversal of 857851421008 is 800124158758.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 702498775104 + 155352645904 = 838152^2 + 394148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857851421003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26807856891 + ... + 26807856922.

Almost surely, 2^857851421008 is an apocalyptic number.

It is an amenable number.

857851421008 is a deficient number, since it is larger than the sum of its proper divisors (804235707226).

857851421008 is a wasteful number, since it uses less digits than its factorization.

857851421008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53615713821 (or 53615713815 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 49.

The spelling of 857851421008 in words is "eight hundred fifty-seven billion, eight hundred fifty-one million, four hundred twenty-one thousand, eight".