20798158769 has 2 divisors, whose sum is σ = 20798158770. Its totient is φ = 20798158768.

The previous prime is 20798158709. The next prime is 20798158813. The reversal of 20798158769 is 96785189702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20209465600 + 588693169 = 142160^2 + 24263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20798158769 is a prime.

It is a super-4 number, since 4×20798158769⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20798158709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399079384 + 10399079385.

It is an arithmetic number, because the mean of its divisors is an integer number (10399079385).

Almost surely, 2^20798158769 is an apocalyptic number.

It is an amenable number.

20798158769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798158769 is an equidigital number, since it uses as much as digits as its factorization.

20798158769 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 62.

The spelling of 20798158769 in words is "twenty billion, seven hundred ninety-eight million, one hundred fifty-eight thousand, seven hundred sixty-nine".