25541424409 has 2 divisors, whose sum is σ = 25541424410. Its totient is φ = 25541424408.

The previous prime is 25541424397. The next prime is 25541424431. The reversal of 25541424409 is 90442414552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19289043225 + 6252381184 = 138885^2 + 79072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25541424409 is a prime.

It is not a weakly prime, because it can be changed into another prime (25541424439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12770712204 + 12770712205.

It is an arithmetic number, because the mean of its divisors is an integer number (12770712205).

Almost surely, 2^25541424409 is an apocalyptic number.

It is an amenable number.

25541424409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25541424409 is an equidigital number, since it uses as much as digits as its factorization.

25541424409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 25541424409 in words is "twenty-five billion, five hundred forty-one million, four hundred twenty-four thousand, four hundred nine".