20256750659851 has 2 divisors, whose sum is σ = 20256750659852. Its totient is φ = 20256750659850.

The previous prime is 20256750659767. The next prime is 20256750659861. The reversal of 20256750659851 is 15895605765202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20256750659851 - 2⁹ = 20256750659339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20256750659851.

It is not a weakly prime, because it can be changed into another prime (20256750659861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128375329925 + 10128375329926.

It is an arithmetic number, because the mean of its divisors is an integer number (10128375329926).

Almost surely, 2^{20256750659851} is an apocalyptic number.

20256750659851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20256750659851 is an equidigital number, since it uses as much as digits as its factorization.

20256750659851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360000, while the sum is 61.

The spelling of 20256750659851 in words is "twenty trillion, two hundred fifty-six billion, seven hundred fifty million, six hundred fifty-nine thousand, eight hundred fifty-one".