20666276633 has 2 divisors, whose sum is σ = 20666276634. Its totient is φ = 20666276632.

The previous prime is 20666276597. The next prime is 20666276651. The reversal of 20666276633 is 33667266602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16237640329 + 4428636304 = 127427^2 + 66548^2 .

It is a cyclic number.

It is not a de Polignac number, because 20666276633 - 2⁸ = 20666276377 is a prime.

It is not a weakly prime, because it can be changed into another prime (20666276663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10333138316 + 10333138317.

It is an arithmetic number, because the mean of its divisors is an integer number (10333138317).

Almost surely, 2^20666276633 is an apocalyptic number.

It is an amenable number.

20666276633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20666276633 is an equidigital number, since it uses as much as digits as its factorization.

20666276633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 47.

The spelling of 20666276633 in words is "twenty billion, six hundred sixty-six million, two hundred seventy-six thousand, six hundred thirty-three".