1618742886181 has 2 divisors, whose sum is σ = 1618742886182. Its totient is φ = 1618742886180.

The previous prime is 1618742886139. The next prime is 1618742886191. The reversal of 1618742886181 is 1816882478161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1615527429156 + 3215457025 = 1271034^2 + 56705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618742886181 - 2⁷ = 1618742886053 is a prime.

It is a super-2 number, since 2×1618742886181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618742886191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809371443090 + 809371443091.

It is an arithmetic number, because the mean of its divisors is an integer number (809371443091).

Almost surely, 2^{1618742886181} is an apocalyptic number.

It is an amenable number.

1618742886181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618742886181 is an equidigital number, since it uses as much as digits as its factorization.

1618742886181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8257536, while the sum is 61.

The spelling of 1618742886181 in words is "one trillion, six hundred eighteen billion, seven hundred forty-two million, eight hundred eighty-six thousand, one hundred eighty-one".