861803975376 has 120 divisors (see below), whose sum is σ = 2425732232040. Its totient is φ = 285619749888.

The previous prime is 861803975371. The next prime is 861803975387. The reversal of 861803975376 is 673579308168.

861803975376 is a `hidden beast` number, since 8 + 6 + 1 + 8 + 0 + 3 + 97 + 537 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 33929640000 + 827874335376 = 184200^2 + 909876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861803975371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17732806 + ... + 17781338.

It is an arithmetic number, because the mean of its divisors is an integer number (20214435267).

Almost surely, 2^861803975376 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 861803975376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212866116020).

861803975376 is an abundant number, since it is smaller than the sum of its proper divisors (1563928256664).

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

861803975376 is a wasteful number, since it uses less digits than its factorization.

861803975376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49253 (or 49244 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 861803975376 in words is "eight hundred sixty-one billion, eight hundred three million, nine hundred seventy-five thousand, three hundred seventy-six".