20257255921999 has 2 divisors, whose sum is σ = 20257255922000. Its totient is φ = 20257255921998.

The previous prime is 20257255921997. The next prime is 20257255922041. The reversal of 20257255921999 is 99912955275202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20257255921999 - 2¹ = 20257255921997 is a prime.

Together with 20257255921997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20257255921997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128627960999 + 10128627961000.

It is an arithmetic number, because the mean of its divisors is an integer number (10128627961000).

Almost surely, 2^{20257255921999} is an apocalyptic number.

20257255921999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257255921999 is an equidigital number, since it uses as much as digits as its factorization.

20257255921999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854000, while the sum is 67.

The spelling of 20257255921999 in words is "twenty trillion, two hundred fifty-seven billion, two hundred fifty-five million, nine hundred twenty-one thousand, nine hundred ninety-nine".