25520434418989 has 2 divisors, whose sum is σ = 25520434418990. Its totient is φ = 25520434418988.

The previous prime is 25520434418987. The next prime is 25520434419013. The reversal of 25520434418989 is 98981443402552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17993461096900 + 7526973322089 = 4241870^2 + 2743533^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520434418989 - 2¹ = 25520434418987 is a prime.

Together with 25520434418987, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25520434418989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25520434418987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760217209494 + 12760217209495.

It is an arithmetic number, because the mean of its divisors is an integer number (12760217209495).

Almost surely, 2^{25520434418989} is an apocalyptic number.

It is an amenable number.

25520434418989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520434418989 is an equidigital number, since it uses as much as digits as its factorization.

25520434418989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99532800, while the sum is 64.

The spelling of 25520434418989 in words is "twenty-five trillion, five hundred twenty billion, four hundred thirty-four million, four hundred eighteen thousand, nine hundred eighty-nine".