25505491399 has 2 divisors, whose sum is σ = 25505491400. Its totient is φ = 25505491398.

The previous prime is 25505491393. The next prime is 25505491463. The reversal of 25505491399 is 99319450552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25505491399 - 2⁵ = 25505491367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505491393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752745699 + 12752745700.

It is an arithmetic number, because the mean of its divisors is an integer number (12752745700).

Almost surely, 2^25505491399 is an apocalyptic number.

25505491399 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505491399 is an equidigital number, since it uses as much as digits as its factorization.

25505491399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187000, while the sum is 52.

The spelling of 25505491399 in words is "twenty-five billion, five hundred five million, four hundred ninety-one thousand, three hundred ninety-nine".