25543054402109 has 2 divisors, whose sum is σ = 25543054402110. Its totient is φ = 25543054402108.

The previous prime is 25543054402091. The next prime is 25543054402207. The reversal of 25543054402109 is 90120445034552.

Together with previous prime (25543054402091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12817760436100 + 12725293966009 = 3580190^2 + 3567253^2 .

It is a cyclic number.

It is not a de Polignac number, because 25543054402109 - 2¹² = 25543054398013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25543054402109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25543054402309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12771527201054 + 12771527201055.

It is an arithmetic number, because the mean of its divisors is an integer number (12771527201055).

Almost surely, 2^{25543054402109} is an apocalyptic number.

It is an amenable number.

25543054402109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25543054402109 is an equidigital number, since it uses as much as digits as its factorization.

25543054402109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 25543054402109 in words is "twenty-five trillion, five hundred forty-three billion, fifty-four million, four hundred two thousand, one hundred nine".