166128126413 has 2 divisors, whose sum is σ = 166128126414. Its totient is φ = 166128126412.

The previous prime is 166128126383. The next prime is 166128126433. The reversal of 166128126413 is 314621821661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86334305929 + 79793820484 = 293827^2 + 282478^2 .

It is a cyclic number.

It is not a de Polignac number, because 166128126413 - 2¹⁰ = 166128125389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166128126433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83064063206 + 83064063207.

It is an arithmetic number, because the mean of its divisors is an integer number (83064063207).

Almost surely, 2^166128126413 is an apocalyptic number.

It is an amenable number.

166128126413 is a deficient number, since it is larger than the sum of its proper divisors (1).

166128126413 is an equidigital number, since it uses as much as digits as its factorization.

166128126413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The spelling of 166128126413 in words is "one hundred sixty-six billion, one hundred twenty-eight million, one hundred twenty-six thousand, four hundred thirteen".