25565218747 has 2 divisors, whose sum is σ = 25565218748. Its totient is φ = 25565218746.

The previous prime is 25565218717. The next prime is 25565218759. The reversal of 25565218747 is 74781256552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25565218747 - 2⁷ = 25565218619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25565218694 and 25565218703.

It is not a weakly prime, because it can be changed into another prime (25565218717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782609373 + 12782609374.

It is an arithmetic number, because the mean of its divisors is an integer number (12782609374).

Almost surely, 2^25565218747 is an apocalyptic number.

25565218747 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565218747 is an equidigital number, since it uses as much as digits as its factorization.

25565218747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704000, while the sum is 52.

The spelling of 25565218747 in words is "twenty-five billion, five hundred sixty-five million, two hundred eighteen thousand, seven hundred forty-seven".