25446144164491 has 2 divisors, whose sum is σ = 25446144164492. Its totient is φ = 25446144164490.

The previous prime is 25446144164449. The next prime is 25446144164521. The reversal of 25446144164491 is 19446144164452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25446144164491 is a prime.

It is not a weakly prime, because it can be changed into another prime (25446144164411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12723072082245 + 12723072082246.

It is an arithmetic number, because the mean of its divisors is an integer number (12723072082246).

Almost surely, 2^{25446144164491} is an apocalyptic number.

25446144164491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25446144164491 is an equidigital number, since it uses as much as digits as its factorization.

25446144164491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13271040, while the sum is 55.

The spelling of 25446144164491 in words is "twenty-five trillion, four hundred forty-six billion, one hundred forty-four million, one hundred sixty-four thousand, four hundred ninety-one".