818622405780 has 192 divisors, whose sum is σ = 2450320588800. Its totient is φ = 203751959040.

The previous prime is 818622405773. The next prime is 818622405791. The reversal of 818622405780 is 87504226818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53015301 + ... + 53030739.

It is an arithmetic number, because the mean of its divisors is an integer number (12762086400).

Almost surely, 2^818622405780 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 818622405780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1225160294400).

818622405780 is an abundant number, since it is smaller than the sum of its proper divisors (1631698183020).

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

818622405780 is a wasteful number, since it uses less digits than its factorization.

818622405780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16494 (or 16492 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 818622405780 in words is "eight hundred eighteen billion, six hundred twenty-two million, four hundred five thousand, seven hundred eighty".