20466777281 has 2 divisors, whose sum is σ = 20466777282. Its totient is φ = 20466777280.

The previous prime is 20466777239. The next prime is 20466777319. The reversal of 20466777281 is 18277766402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13244327056 + 7222450225 = 115084^2 + 84985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466777281 - 2¹⁰ = 20466776257 is a prime.

It is a super-2 number, since 2×20466777281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20466773281) 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, 10233388640 + 10233388641.

It is an arithmetic number, because the mean of its divisors is an integer number (10233388641).

Almost surely, 2^20466777281 is an apocalyptic number.

It is an amenable number.

20466777281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466777281 is an equidigital number, since it uses as much as digits as its factorization.

20466777281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 20466777281 in words is "twenty billion, four hundred sixty-six million, seven hundred seventy-seven thousand, two hundred eighty-one".