20168770751 has 2 divisors, whose sum is σ = 20168770752. Its totient is φ = 20168770750.

The previous prime is 20168770723. The next prime is 20168770823. The reversal of 20168770751 is 15707786102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20168770751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20168770711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10084385375 + 10084385376.

It is an arithmetic number, because the mean of its divisors is an integer number (10084385376).

Almost surely, 2^20168770751 is an apocalyptic number.

20168770751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20168770751 is an equidigital number, since it uses as much as digits as its factorization.

20168770751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 44.

The spelling of 20168770751 in words is "twenty billion, one hundred sixty-eight million, seven hundred seventy thousand, seven hundred fifty-one".