25717802749 has 2 divisors, whose sum is σ = 25717802750. Its totient is φ = 25717802748.

The previous prime is 25717802741. The next prime is 25717802813. The reversal of 25717802749 is 94720871752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25586241849 + 131560900 = 159957^2 + 11470^2 .

It is a cyclic number.

It is not a de Polignac number, because 25717802749 - 2³ = 25717802741 is a prime.

It is a super-2 number, since 2×25717802749² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25717802696 and 25717802705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25717802741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12858901374 + 12858901375.

It is an arithmetic number, because the mean of its divisors is an integer number (12858901375).

Almost surely, 2^25717802749 is an apocalyptic number.

It is an amenable number.

25717802749 is a deficient number, since it is larger than the sum of its proper divisors (1).

25717802749 is an equidigital number, since it uses as much as digits as its factorization.

25717802749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 25717802749 in words is "twenty-five billion, seven hundred seventeen million, eight hundred two thousand, seven hundred forty-nine".