25665416729 has 2 divisors, whose sum is σ = 25665416730. Its totient is φ = 25665416728.

The previous prime is 25665416719. The next prime is 25665416773. The reversal of 25665416729 is 92761456652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24225366025 + 1440050704 = 155645^2 + 37948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25665416729 is a prime.

It is not a weakly prime, because it can be changed into another prime (25665416719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832708364 + 12832708365.

It is an arithmetic number, because the mean of its divisors is an integer number (12832708365).

Almost surely, 2^25665416729 is an apocalyptic number.

It is an amenable number.

25665416729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665416729 is an equidigital number, since it uses as much as digits as its factorization.

25665416729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The spelling of 25665416729 in words is "twenty-five billion, six hundred sixty-five million, four hundred sixteen thousand, seven hundred twenty-nine".