1817011816811 has 4 divisors (see below), whose sum is σ = 1817103359952. Its totient is φ = 1816920273672.

The previous prime is 1817011816709. The next prime is 1817011816813. The reversal of 1817011816811 is 1186181107181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1817011816811 is a prime.

It is a super-2 number, since 2×1817011816811² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1817011816813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 45741791 + ... + 45781496.

It is an arithmetic number, because the mean of its divisors is an integer number (454275839988).

Almost surely, 2^{1817011816811} is an apocalyptic number.

1817011816811 is a deficient number, since it is larger than the sum of its proper divisors (91543141).

1817011816811 is an equidigital number, since it uses as much as digits as its factorization.

1817011816811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91543140.

The product of its (nonzero) digits is 21504, while the sum is 44.

The spelling of 1817011816811 in words is "one trillion, eight hundred seventeen billion, eleven million, eight hundred sixteen thousand, eight hundred eleven".