25621647017 has 2 divisors, whose sum is σ = 25621647018. Its totient is φ = 25621647016.

The previous prime is 25621647013. The next prime is 25621647031. The reversal of 25621647017 is 71074612652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17535321241 + 8086325776 = 132421^2 + 89924^2 .

It is a cyclic number.

It is not a de Polignac number, because 25621647017 - 2² = 25621647013 is a prime.

It is not a weakly prime, because it can be changed into another prime (25621647013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810823508 + 12810823509.

It is an arithmetic number, because the mean of its divisors is an integer number (12810823509).

Almost surely, 2^25621647017 is an apocalyptic number.

It is an amenable number.

25621647017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621647017 is an equidigital number, since it uses as much as digits as its factorization.

25621647017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 25621647017 in words is "twenty-five billion, six hundred twenty-one million, six hundred forty-seven thousand, seventeen".