20466663742193 has 2 divisors, whose sum is σ = 20466663742194. Its totient is φ = 20466663742192.

The previous prime is 20466663742087. The next prime is 20466663742253. The reversal of 20466663742193 is 39124736666402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16739169370609 + 3727494371584 = 4091353^2 + 1930672^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466663742193 - 2¹⁸ = 20466663480049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20466663702193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233331871096 + 10233331871097.

It is an arithmetic number, because the mean of its divisors is an integer number (10233331871097).

Almost surely, 2^{20466663742193} is an apocalyptic number.

It is an amenable number.

20466663742193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466663742193 is an equidigital number, since it uses as much as digits as its factorization.

20466663742193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47029248, while the sum is 59.

The spelling of 20466663742193 in words is "twenty trillion, four hundred sixty-six billion, six hundred sixty-three million, seven hundred forty-two thousand, one hundred ninety-three".