25645432573 has 2 divisors, whose sum is σ = 25645432574. Its totient is φ = 25645432572.

The previous prime is 25645432543. The next prime is 25645432601. The reversal of 25645432573 is 37523454652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24192069444 + 1453363129 = 155538^2 + 38123^2 .

It is a cyclic number.

It is not a de Polignac number, because 25645432573 - 2⁵ = 25645432541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25645432543) 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, 12822716286 + 12822716287.

It is an arithmetic number, because the mean of its divisors is an integer number (12822716287).

Almost surely, 2^25645432573 is an apocalyptic number.

It is an amenable number.

25645432573 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645432573 is an equidigital number, since it uses as much as digits as its factorization.

25645432573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 46.

The spelling of 25645432573 in words is "twenty-five billion, six hundred forty-five million, four hundred thirty-two thousand, five hundred seventy-three".