8421857377968 has 160 divisors (see below), whose sum is σ = 23023537113600. Its totient is φ = 2645404489728.

The previous prime is 8421857377961. The next prime is 8421857377991. The reversal of 8421857377968 is 8697737581248.

It is a self number, because there is not a number n which added to its sum of digits gives 8421857377968.

It is not an unprimeable number, because it can be changed into a prime (8421857377961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129948580 + ... + 130013372.

It is an arithmetic number, because the mean of its divisors is an integer number (143897106960).

Almost surely, 2^{8421857377968} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8421857377968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11511768556800).

8421857377968 is an abundant number, since it is smaller than the sum of its proper divisors (14601679735632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421857377968 is a wasteful number, since it uses less digits than its factorization.

8421857377968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65579 (or 65573 counting only the distinct ones).

The product of its digits is 1137991680, while the sum is 75.

The spelling of 8421857377968 in words is "eight trillion, four hundred twenty-one billion, eight hundred fifty-seven million, three hundred seventy-seven thousand, nine hundred sixty-eight".