25209774479 has 2 divisors, whose sum is σ = 25209774480. Its totient is φ = 25209774478.

The previous prime is 25209774439. The next prime is 25209774511. The reversal of 25209774479 is 97447790252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25209774479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25209774409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604887239 + 12604887240.

It is an arithmetic number, because the mean of its divisors is an integer number (12604887240).

Almost surely, 2^25209774479 is an apocalyptic number.

25209774479 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209774479 is an equidigital number, since it uses as much as digits as its factorization.

25209774479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 25209774479 in words is "twenty-five billion, two hundred nine million, seven hundred seventy-four thousand, four hundred seventy-nine".