20788068661 has 2 divisors, whose sum is σ = 20788068662. Its totient is φ = 20788068660.

The previous prime is 20788068649. The next prime is 20788068667. The reversal of 20788068661 is 16686088702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12137208561 + 8650860100 = 110169^2 + 93010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20788068661 - 2⁹ = 20788068149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20788068599 and 20788068608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20788068667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394034330 + 10394034331.

It is an arithmetic number, because the mean of its divisors is an integer number (10394034331).

Almost surely, 2^20788068661 is an apocalyptic number.

It is an amenable number.

20788068661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20788068661 is an equidigital number, since it uses as much as digits as its factorization.

20788068661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 20788068661 in words is "twenty billion, seven hundred eighty-eight million, sixty-eight thousand, six hundred sixty-one".