1811265804980 has 12 divisors (see below), whose sum is σ = 3803658190500. Its totient is φ = 724506321984.

The previous prime is 1811265804947. The next prime is 1811265805003. The reversal of 1811265804980 is 894085621181.

It can be written as a sum of positive squares in 2 ways, for example, as 833390061604 + 977875743376 = 912902^2 + 988876^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45281645105 + ... + 45281645144.

It is an arithmetic number, because the mean of its divisors is an integer number (316971515875).

Almost surely, 2^{1811265804980} is an apocalyptic number.

1811265804980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1811265804980 is an abundant number, since it is smaller than the sum of its proper divisors (1992392385520).

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

1811265804980 is a wasteful number, since it uses less digits than its factorization.

1811265804980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90563290258 (or 90563290256 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 1811265804980 in words is "one trillion, eight hundred eleven billion, two hundred sixty-five million, eight hundred four thousand, nine hundred eighty".