25263071261 has 2 divisors, whose sum is σ = 25263071262. Its totient is φ = 25263071260.

The previous prime is 25263071243. The next prime is 25263071263. The reversal of 25263071261 is 16217036252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16638420100 + 8624651161 = 128990^2 + 92869^2 .

It is a cyclic number.

It is not a de Polignac number, because 25263071261 - 2¹⁴ = 25263054877 is a prime.

Together with 25263071263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25263071263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12631535630 + 12631535631.

It is an arithmetic number, because the mean of its divisors is an integer number (12631535631).

Almost surely, 2^25263071261 is an apocalyptic number.

It is an amenable number.

25263071261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25263071261 is an equidigital number, since it uses as much as digits as its factorization.

25263071261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 25263071261 in words is "twenty-five billion, two hundred sixty-three million, seventy-one thousand, two hundred sixty-one".