25206081361 has 2 divisors, whose sum is σ = 25206081362. Its totient is φ = 25206081360.

The previous prime is 25206081337. The next prime is 25206081379. The reversal of 25206081361 is 16318060252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23740646400 + 1465434961 = 154080^2 + 38281^2 .

It is a cyclic number.

It is not a de Polignac number, because 25206081361 - 2⁹ = 25206080849 is a prime.

It is a super-2 number, since 2×25206081361² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25206081301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12603040680 + 12603040681.

It is an arithmetic number, because the mean of its divisors is an integer number (12603040681).

Almost surely, 2^25206081361 is an apocalyptic number.

It is an amenable number.

25206081361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25206081361 is an equidigital number, since it uses as much as digits as its factorization.

25206081361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 25206081361 in words is "twenty-five billion, two hundred six million, eighty-one thousand, three hundred sixty-one".