1816312621920 has 96 divisors (see below), whose sum is σ = 5762546012160. Its totient is φ = 480865482240.

The previous prime is 1816312621867. The next prime is 1816312621969. The reversal of 1816312621920 is 291262136181.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13544736 + ... + 13678175.

It is an arithmetic number, because the mean of its divisors is an integer number (60026520960).

Almost surely, 2^{1816312621920} is an apocalyptic number.

1816312621920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816312621920 is an abundant number, since it is smaller than the sum of its proper divisors (3946233390240).

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

1816312621920 is a wasteful number, since it uses less digits than its factorization.

1816312621920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27223068 (or 27223060 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 1816312621920 in words is "one trillion, eight hundred sixteen billion, three hundred twelve million, six hundred twenty-one thousand, nine hundred twenty".