3666426343121 has 2 divisors, whose sum is σ = 3666426343122. Its totient is φ = 3666426343120.

The previous prime is 3666426343117. The next prime is 3666426343169. The reversal of 3666426343121 is 1213436246663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3630697782721 + 35728560400 = 1905439^2 + 189020^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666426343121 - 2² = 3666426343117 is a prime.

It is not a weakly prime, because it can be changed into another prime (3666426343171) 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 as a sum of consecutive naturals, namely, 1833213171560 + 1833213171561.

It is an arithmetic number, because the mean of its divisors is an integer number (1833213171561).

Almost surely, 2^{3666426343121} is an apocalyptic number.

It is an amenable number.

3666426343121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666426343121 is an equidigital number, since it uses as much as digits as its factorization.

3666426343121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 47.

The spelling of 3666426343121 in words is "three trillion, six hundred sixty-six billion, four hundred twenty-six million, three hundred forty-three thousand, one hundred twenty-one".