25666603127461 has 2 divisors, whose sum is σ = 25666603127462. Its totient is φ = 25666603127460.

The previous prime is 25666603127419. The next prime is 25666603127467. The reversal of 25666603127461 is 16472130666652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25637462589025 + 29140538436 = 5063345^2 + 170706^2 .

It is a cyclic number.

It is not a de Polignac number, because 25666603127461 - 2¹¹ = 25666603125413 is a prime.

It is a super-2 number, since 2×25666603127461² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666603127467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833301563730 + 12833301563731.

It is an arithmetic number, because the mean of its divisors is an integer number (12833301563731).

Almost surely, 2^{25666603127461} is an apocalyptic number.

It is an amenable number.

25666603127461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666603127461 is an equidigital number, since it uses as much as digits as its factorization.

25666603127461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 25666603127461 in words is "twenty-five trillion, six hundred sixty-six billion, six hundred three million, one hundred twenty-seven thousand, four hundred sixty-one".