25406662049 has 2 divisors, whose sum is σ = 25406662050. Its totient is φ = 25406662048.

The previous prime is 25406662007. The next prime is 25406662093. The reversal of 25406662049 is 94026660452.

It is an a-pointer prime, because the next prime (25406662093) can be obtained adding 25406662049 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13614222400 + 11792439649 = 116680^2 + 108593^2 .

It is a cyclic number.

It is not a de Polignac number, because 25406662049 - 2⁸ = 25406661793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25406662549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12703331024 + 12703331025.

It is an arithmetic number, because the mean of its divisors is an integer number (12703331025).

Almost surely, 2^25406662049 is an apocalyptic number.

It is an amenable number.

25406662049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25406662049 is an equidigital number, since it uses as much as digits as its factorization.

25406662049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 25406662049 in words is "twenty-five billion, four hundred six million, six hundred sixty-two thousand, forty-nine".