25545355615993 has 2 divisors, whose sum is σ = 25545355615994. Its totient is φ = 25545355615992.

The previous prime is 25545355615921. The next prime is 25545355616047. The reversal of 25545355615993 is 39951655354552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24787573178944 + 757782437049 = 4978712^2 + 870507^2 .

It is a cyclic number.

It is not a de Polignac number, because 25545355615993 - 2¹³ = 25545355607801 is a prime.

It is not a weakly prime, because it can be changed into another prime (25545355615393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12772677807996 + 12772677807997.

It is an arithmetic number, because the mean of its divisors is an integer number (12772677807997).

Almost surely, 2^{25545355615993} is an apocalyptic number.

It is an amenable number.

25545355615993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25545355615993 is an equidigital number, since it uses as much as digits as its factorization.

25545355615993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 546750000, while the sum is 67.

The spelling of 25545355615993 in words is "twenty-five trillion, five hundred forty-five billion, three hundred fifty-five million, six hundred fifteen thousand, nine hundred ninety-three".