25505144573 has 2 divisors, whose sum is σ = 25505144574. Its totient is φ = 25505144572.

The previous prime is 25505144563. The next prime is 25505144603. The reversal of 25505144573 is 37544150552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17073864889 + 8431279684 = 130667^2 + 91822^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505144573 - 2²⁴ = 25488367357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25505144573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505144563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752572286 + 12752572287.

It is an arithmetic number, because the mean of its divisors is an integer number (12752572287).

Almost surely, 2^25505144573 is an apocalyptic number.

It is an amenable number.

25505144573 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505144573 is an equidigital number, since it uses as much as digits as its factorization.

25505144573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420000, while the sum is 41.

The spelling of 25505144573 in words is "twenty-five billion, five hundred five million, one hundred forty-four thousand, five hundred seventy-three".