20799168251 has 2 divisors, whose sum is σ = 20799168252. Its totient is φ = 20799168250.

The previous prime is 20799168233. The next prime is 20799168263. The reversal of 20799168251 is 15286199702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20799168251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20799168251.

It is not a weakly prime, because it can be changed into another prime (20799168281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399584125 + 10399584126.

It is an arithmetic number, because the mean of its divisors is an integer number (10399584126).

Almost surely, 2^20799168251 is an apocalyptic number.

20799168251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20799168251 is an equidigital number, since it uses as much as digits as its factorization.

20799168251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 20799168251 in words is "twenty billion, seven hundred ninety-nine million, one hundred sixty-eight thousand, two hundred fifty-one".