818861172800 has 168 divisors, whose sum is σ = 2198877492000. Its totient is φ = 297660211200.

The previous prime is 818861172791. The next prime is 818861172839. The reversal of 818861172800 is 8271168818.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61575752 + ... + 61589048.

It is an arithmetic number, because the mean of its divisors is an integer number (13088556500).

Almost surely, 2^818861172800 is an apocalyptic number.

818861172800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818861172800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099438746000).

818861172800 is an abundant number, since it is smaller than the sum of its proper divisors (1380016319200).

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

818861172800 is a wasteful number, since it uses less digits than its factorization.

818861172800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16829 (or 16814 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 50.

The spelling of 818861172800 in words is "eight hundred eighteen billion, eight hundred sixty-one million, one hundred seventy-two thousand, eight hundred".