25660040293 has 2 divisors, whose sum is σ = 25660040294. Its totient is φ = 25660040292.

The previous prime is 25660040291. The next prime is 25660040297. The reversal of 25660040293 is 39204006652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25116544324 + 543495969 = 158482^2 + 23313^2 .

It is a cyclic number.

It is not a de Polignac number, because 25660040293 - 2¹ = 25660040291 is a prime.

Together with 25660040291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25660040291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830020146 + 12830020147.

It is an arithmetic number, because the mean of its divisors is an integer number (12830020147).

Almost surely, 2^25660040293 is an apocalyptic number.

It is an amenable number.

25660040293 is a deficient number, since it is larger than the sum of its proper divisors (1).

25660040293 is an equidigital number, since it uses as much as digits as its factorization.

25660040293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 25660040293 in words is "twenty-five billion, six hundred sixty million, forty thousand, two hundred ninety-three".