25891377361 has 2 divisors, whose sum is σ = 25891377362. Its totient is φ = 25891377360.

The previous prime is 25891377353. The next prime is 25891377389. The reversal of 25891377361 is 16377319852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25378083025 + 513294336 = 159305^2 + 22656^2 .

It is a cyclic number.

It is not a de Polignac number, because 25891377361 - 2³ = 25891377353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25891377299 and 25891377308.

It is not a weakly prime, because it can be changed into another prime (25891377331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945688680 + 12945688681.

It is an arithmetic number, because the mean of its divisors is an integer number (12945688681).

Almost surely, 2^25891377361 is an apocalyptic number.

It is an amenable number.

25891377361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25891377361 is an equidigital number, since it uses as much as digits as its factorization.

25891377361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 52.

The spelling of 25891377361 in words is "twenty-five billion, eight hundred ninety-one million, three hundred seventy-seven thousand, three hundred sixty-one".