25350221261 has 2 divisors, whose sum is σ = 25350221262. Its totient is φ = 25350221260.

The previous prime is 25350221179. The next prime is 25350221291. The reversal of 25350221261 is 16212205352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24301692100 + 1048529161 = 155890^2 + 32381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25350221261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25350221291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12675110630 + 12675110631.

It is an arithmetic number, because the mean of its divisors is an integer number (12675110631).

Almost surely, 2^25350221261 is an apocalyptic number.

It is an amenable number.

25350221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25350221261 is an equidigital number, since it uses as much as digits as its factorization.

25350221261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 25350221261 in words is "twenty-five billion, three hundred fifty million, two hundred twenty-one thousand, two hundred sixty-one".