20974662166529 has 2 divisors, whose sum is σ = 20974662166530. Its totient is φ = 20974662166528.

The previous prime is 20974662166453. The next prime is 20974662166559. The reversal of 20974662166529 is 92566126647902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18762957814129 + 2211704352400 = 4331623^2 + 1487180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20974662166529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20974662166559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487331083264 + 10487331083265.

It is an arithmetic number, because the mean of its divisors is an integer number (10487331083265).

Almost surely, 2^{20974662166529} is an apocalyptic number.

It is an amenable number.

20974662166529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974662166529 is an equidigital number, since it uses as much as digits as its factorization.

20974662166529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117573120, while the sum is 65.

The spelling of 20974662166529 in words is "twenty trillion, nine hundred seventy-four billion, six hundred sixty-two million, one hundred sixty-six thousand, five hundred twenty-nine".