20678666753 has 2 divisors, whose sum is σ = 20678666754. Its totient is φ = 20678666752.

The previous prime is 20678666639. The next prime is 20678666759. The reversal of 20678666753 is 35766687602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20396695489 + 281971264 = 142817^2 + 16792^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678666753 - 2¹⁸ = 20678404609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20678666759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339333376 + 10339333377.

It is an arithmetic number, because the mean of its divisors is an integer number (10339333377).

Almost surely, 2^20678666753 is an apocalyptic number.

It is an amenable number.

20678666753 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678666753 is an equidigital number, since it uses as much as digits as its factorization.

20678666753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 56.

The spelling of 20678666753 in words is "twenty billion, six hundred seventy-eight million, six hundred sixty-six thousand, seven hundred fifty-three".