1820423227776 has 128 divisors (see below), whose sum is σ = 4874249520000. Its totient is φ = 601952096256.

The previous prime is 1820423227769. The next prime is 1820423227781. The reversal of 1820423227776 is 6777223240281.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68788435 + ... + 68814893.

It is an arithmetic number, because the mean of its divisors is an integer number (38080074375).

Almost surely, 2^{1820423227776} is an apocalyptic number.

1820423227776 is a gapful number since it is divisible by the number (16) 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 1820423227776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2437124760000).

1820423227776 is an abundant number, since it is smaller than the sum of its proper divisors (3053826292224).

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

1820423227776 is a wasteful number, since it uses less digits than its factorization.

1820423227776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27904 (or 27892 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 51.

The spelling of 1820423227776 in words is "one trillion, eight hundred twenty billion, four hundred twenty-three million, two hundred twenty-seven thousand, seven hundred seventy-six".