1816676766181 has 4 divisors (see below), whose sum is σ = 1825898475852. Its totient is φ = 1807455056512.

The previous prime is 1816676766169. The next prime is 1816676766193.

1816676766181 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (1816676766169) and next prime (1816676766193).

It can be written as a sum of positive squares in 2 ways, for example, as 1656024101956 + 160652664225 = 1286866^2 + 400815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816676766181 - 2⁷ = 1816676766053 is a prime.

It is a super-2 number, since 2×1816676766181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816676766581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610854540 + ... + 4610854933.

It is an arithmetic number, because the mean of its divisors is an integer number (456474618963).

Almost surely, 2^{1816676766181} is an apocalyptic number.

It is an amenable number.

1816676766181 is a deficient number, since it is larger than the sum of its proper divisors (9221709671).

1816676766181 is an equidigital number, since it uses as much as digits as its factorization.

1816676766181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9221709670.

The product of its digits is 24385536, while the sum is 64.

The spelling of 1816676766181 in words is "one trillion, eight hundred sixteen billion, six hundred seventy-six million, seven hundred sixty-six thousand, one hundred eighty-one".