20661063433 has 2 divisors, whose sum is σ = 20661063434. Its totient is φ = 20661063432.

The previous prime is 20661063419. The next prime is 20661063523. The reversal of 20661063433 is 33436016602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19809999504 + 851063929 = 140748^2 + 29173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20661063433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20661063413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330531716 + 10330531717.

It is an arithmetic number, because the mean of its divisors is an integer number (10330531717).

Almost surely, 2^20661063433 is an apocalyptic number.

It is an amenable number.

20661063433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20661063433 is an equidigital number, since it uses as much as digits as its factorization.

20661063433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 34.

The spelling of 20661063433 in words is "twenty billion, six hundred sixty-one million, sixty-three thousand, four hundred thirty-three".