25305560993 has 2 divisors, whose sum is σ = 25305560994. Its totient is φ = 25305560992.

The previous prime is 25305560981. The next prime is 25305560999. The reversal of 25305560993 is 39906550352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20302545169 + 5003015824 = 142487^2 + 70732^2 .

It is a cyclic number.

It is not a de Polignac number, because 25305560993 - 2⁸ = 25305560737 is a prime.

It is not a weakly prime, because it can be changed into another prime (25305560999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12652780496 + 12652780497.

It is an arithmetic number, because the mean of its divisors is an integer number (12652780497).

Almost surely, 2^25305560993 is an apocalyptic number.

It is an amenable number.

25305560993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25305560993 is an equidigital number, since it uses as much as digits as its factorization.

25305560993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1093500, while the sum is 47.

The spelling of 25305560993 in words is "twenty-five billion, three hundred five million, five hundred sixty thousand, nine hundred ninety-three".