25661554343 has 2 divisors, whose sum is σ = 25661554344. Its totient is φ = 25661554342.

The previous prime is 25661554297. The next prime is 25661554357. The reversal of 25661554343 is 34345516652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25661554343 - 2¹⁰ = 25661553319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25661554294 and 25661554303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25661554643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830777171 + 12830777172.

It is an arithmetic number, because the mean of its divisors is an integer number (12830777172).

Almost surely, 2^25661554343 is an apocalyptic number.

25661554343 is a deficient number, since it is larger than the sum of its proper divisors (1).

25661554343 is an equidigital number, since it uses as much as digits as its factorization.

25661554343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 44.

The spelling of 25661554343 in words is "twenty-five billion, six hundred sixty-one million, five hundred fifty-four thousand, three hundred forty-three".