855898821904 has 405 divisors, whose sum is σ = 2137898987973. Its totient is φ = 330921739008.

The previous prime is 855898821881. The next prime is 855898821971. The reversal of 855898821904 is 409128898558.

The square root of 855898821904 is 925148.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 765870019600 + 90028802304 = 875140^2 + 300048^2 .

It is a super-2 number, since 2×855898821904² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 855898821904.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 18210613209 + ... + 18210613255.

Almost surely, 2^855898821904 is an apocalyptic number.

855898821904 is the 925148-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855898821904

855898821904 is an abundant number, since it is smaller than the sum of its proper divisors (1282000166069).

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

855898821904 is a wasteful number, since it uses less digits than its factorization.

855898821904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 67.

The spelling of 855898821904 in words is "eight hundred fifty-five billion, eight hundred ninety-eight million, eight hundred twenty-one thousand, nine hundred four".