25561678143461 has 2 divisors, whose sum is σ = 25561678143462. Its totient is φ = 25561678143460.

The previous prime is 25561678143349. The next prime is 25561678143467. The reversal of 25561678143461 is 16434187616552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23456886519361 + 2104791624100 = 4843231^2 + 1450790^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561678143461 - 2¹⁰ = 25561678142437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25561678143461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25561678143467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780839071730 + 12780839071731.

It is an arithmetic number, because the mean of its divisors is an integer number (12780839071731).

Almost surely, 2^{25561678143461} is an apocalyptic number.

It is an amenable number.

25561678143461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25561678143461 is an equidigital number, since it uses as much as digits as its factorization.

25561678143461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 59.

The spelling of 25561678143461 in words is "twenty-five trillion, five hundred sixty-one billion, six hundred seventy-eight million, one hundred forty-three thousand, four hundred sixty-one".