1641866679413 has 2 divisors, whose sum is σ = 1641866679414. Its totient is φ = 1641866679412.

The previous prime is 1641866679379. The next prime is 1641866679433. The reversal of 1641866679413 is 3149766681461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538547505924 + 103319173489 = 1240382^2 + 321433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641866679413 - 2¹⁴ = 1641866663029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641866679433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820933339706 + 820933339707.

It is an arithmetic number, because the mean of its divisors is an integer number (820933339707).

Almost surely, 2^{1641866679413} is an apocalyptic number.

It is an amenable number.

1641866679413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641866679413 is an equidigital number, since it uses as much as digits as its factorization.

1641866679413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 62.

The spelling of 1641866679413 in words is "one trillion, six hundred forty-one billion, eight hundred sixty-six million, six hundred seventy-nine thousand, four hundred thirteen".