20257255921933 has 2 divisors, whose sum is σ = 20257255921934. Its totient is φ = 20257255921932.

The previous prime is 20257255921867. The next prime is 20257255921937. The reversal of 20257255921933 is 33912955275202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13299172120809 + 6958083801124 = 3646803^2 + 2637818^2 .

It is a cyclic number.

It is not a de Polignac number, because 20257255921933 - 2²⁹ = 20256719051021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20257255921937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128627960966 + 10128627960967.

It is an arithmetic number, because the mean of its divisors is an integer number (10128627960967).

Almost surely, 2^{20257255921933} is an apocalyptic number.

It is an amenable number.

20257255921933 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257255921933 is an equidigital number, since it uses as much as digits as its factorization.

20257255921933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206000, while the sum is 55.

The spelling of 20257255921933 in words is "twenty trillion, two hundred fifty-seven billion, two hundred fifty-five million, nine hundred twenty-one thousand, nine hundred thirty-three".