25829752661 has 2 divisors, whose sum is σ = 25829752662. Its totient is φ = 25829752660.

The previous prime is 25829752609. The next prime is 25829752667. The reversal of 25829752661 is 16625792852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20269216900 + 5560535761 = 142370^2 + 74569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25829752661 is a prime.

It is a super-2 number, since 2×25829752661² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25829752667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12914876330 + 12914876331.

It is an arithmetic number, because the mean of its divisors is an integer number (12914876331).

Almost surely, 2^25829752661 is an apocalyptic number.

It is an amenable number.

25829752661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25829752661 is an equidigital number, since it uses as much as digits as its factorization.

25829752661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The spelling of 25829752661 in words is "twenty-five billion, eight hundred twenty-nine million, seven hundred fifty-two thousand, six hundred sixty-one".