1272416862181 has 2 divisors, whose sum is σ = 1272416862182. Its totient is φ = 1272416862180.

The previous prime is 1272416862173. The next prime is 1272416862193. The reversal of 1272416862181 is 1812686142721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196761609156 + 75655253025 = 1093966^2 + 275055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272416862181 - 2³ = 1272416862173 is a prime.

It is a super-2 number, since 2×1272416862181² (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 (1272416860181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636208431090 + 636208431091.

It is an arithmetic number, because the mean of its divisors is an integer number (636208431091).

Almost surely, 2^{1272416862181} is an apocalyptic number.

It is an amenable number.

1272416862181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272416862181 is an equidigital number, since it uses as much as digits as its factorization.

1272416862181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 49.

The spelling of 1272416862181 in words is "one trillion, two hundred seventy-two billion, four hundred sixteen million, eight hundred sixty-two thousand, one hundred eighty-one".