25363429781 has 2 divisors, whose sum is σ = 25363429782. Its totient is φ = 25363429780.

The previous prime is 25363429747. The next prime is 25363429843. The reversal of 25363429781 is 18792436352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21168795025 + 4194634756 = 145495^2 + 64766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25363429781 is a prime.

It is a super-2 number, since 2×25363429781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25363429711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12681714890 + 12681714891.

It is an arithmetic number, because the mean of its divisors is an integer number (12681714891).

Almost surely, 2^25363429781 is an apocalyptic number.

It is an amenable number.

25363429781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25363429781 is an equidigital number, since it uses as much as digits as its factorization.

25363429781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The spelling of 25363429781 in words is "twenty-five billion, three hundred sixty-three million, four hundred twenty-nine thousand, seven hundred eighty-one".