25770866221 has 2 divisors, whose sum is σ = 25770866222. Its totient is φ = 25770866220.

The previous prime is 25770866213. The next prime is 25770866243. The reversal of 25770866221 is 12266807752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19359661321 + 6411204900 = 139139^2 + 80070^2 .

It is a cyclic number.

It is not a de Polignac number, because 25770866221 - 2³ = 25770866213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25770876221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12885433110 + 12885433111.

It is an arithmetic number, because the mean of its divisors is an integer number (12885433111).

Almost surely, 2^25770866221 is an apocalyptic number.

It is an amenable number.

25770866221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25770866221 is an equidigital number, since it uses as much as digits as its factorization.

25770866221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 25770866221 in words is "twenty-five billion, seven hundred seventy million, eight hundred sixty-six thousand, two hundred twenty-one".