1811475938801 has 2 divisors, whose sum is σ = 1811475938802. Its totient is φ = 1811475938800.

The previous prime is 1811475938773. The next prime is 1811475938803. The reversal of 1811475938801 is 1088395741181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1451841845776 + 359634093025 = 1204924^2 + 599695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1811475938801 is a prime.

Together with 1811475938803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1811475938803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905737969400 + 905737969401.

It is an arithmetic number, because the mean of its divisors is an integer number (905737969401).

Almost surely, 2^{1811475938801} is an apocalyptic number.

It is an amenable number.

1811475938801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811475938801 is an equidigital number, since it uses as much as digits as its factorization.

1811475938801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 56.

The spelling of 1811475938801 in words is "one trillion, eight hundred eleven billion, four hundred seventy-five million, nine hundred thirty-eight thousand, eight hundred one".