25627708721 has 2 divisors, whose sum is σ = 25627708722. Its totient is φ = 25627708720.

The previous prime is 25627708663. The next prime is 25627708789. The reversal of 25627708721 is 12780772652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20992822321 + 4634886400 = 144889^2 + 68080^2 .

It is a cyclic number.

It is not a de Polignac number, because 25627708721 - 2¹⁸ = 25627446577 is a prime.

It is not a weakly prime, because it can be changed into another prime (25627708121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12813854360 + 12813854361.

It is an arithmetic number, because the mean of its divisors is an integer number (12813854361).

Almost surely, 2^25627708721 is an apocalyptic number.

It is an amenable number.

25627708721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25627708721 is an equidigital number, since it uses as much as digits as its factorization.

25627708721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658560, while the sum is 47.

The spelling of 25627708721 in words is "twenty-five billion, six hundred twenty-seven million, seven hundred eight thousand, seven hundred twenty-one".