25666250651 has 2 divisors, whose sum is σ = 25666250652. Its totient is φ = 25666250650.

The previous prime is 25666250647. The next prime is 25666250653. The reversal of 25666250651 is 15605266652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25666250651 - 2² = 25666250647 is a prime.

It is a super-3 number, since 3×25666250651³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 25666250653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25666250653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833125325 + 12833125326.

It is an arithmetic number, because the mean of its divisors is an integer number (12833125326).

Almost surely, 2^25666250651 is an apocalyptic number.

25666250651 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666250651 is an equidigital number, since it uses as much as digits as its factorization.

25666250651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 25666250651 in words is "twenty-five billion, six hundred sixty-six million, two hundred fifty thousand, six hundred fifty-one".