25512207023561 has 2 divisors, whose sum is σ = 25512207023562. Its totient is φ = 25512207023560.

The previous prime is 25512207023473. The next prime is 25512207023581. The reversal of 25512207023561 is 16532070221552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24128922894400 + 1383284129161 = 4912120^2 + 1176131^2 .

It is a cyclic number.

It is not a de Polignac number, because 25512207023561 - 2²⁶ = 25512139914697 is a prime.

It is not a weakly prime, because it can be changed into another prime (25512207023581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756103511780 + 12756103511781.

It is an arithmetic number, because the mean of its divisors is an integer number (12756103511781).

Almost surely, 2^{25512207023561} is an apocalyptic number.

It is an amenable number.

25512207023561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25512207023561 is an equidigital number, since it uses as much as digits as its factorization.

25512207023561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 25512207023561 in words is "twenty-five trillion, five hundred twelve billion, two hundred seven million, twenty-three thousand, five hundred sixty-one".