1612211186881 has 2 divisors, whose sum is σ = 1612211186882. Its totient is φ = 1612211186880.

The previous prime is 1612211186867. The next prime is 1612211186923. The reversal of 1612211186881 is 1886811122161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1342912463281 + 269298723600 = 1158841^2 + 518940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612211186881 - 2⁷ = 1612211186753 is a prime.

It is a super-2 number, since 2×1612211186881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1612211186801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806105593440 + 806105593441.

It is an arithmetic number, because the mean of its divisors is an integer number (806105593441).

Almost surely, 2^{1612211186881} is an apocalyptic number.

It is an amenable number.

1612211186881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612211186881 is an equidigital number, since it uses as much as digits as its factorization.

1612211186881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 46.

The spelling of 1612211186881 in words is "one trillion, six hundred twelve billion, two hundred eleven million, one hundred eighty-six thousand, eight hundred eighty-one".