25599047009 has 2 divisors, whose sum is σ = 25599047010. Its totient is φ = 25599047008.

The previous prime is 25599047003. The next prime is 25599047017. The reversal of 25599047009 is 90074099552.

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., 24875598400 + 723448609 = 157720^2 + 26897^2 .

It is a cyclic number.

It is not a de Polignac number, because 25599047009 - 2¹² = 25599042913 is a prime.

It is a super-2 number, since 2×25599047009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25599047003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12799523504 + 12799523505.

It is an arithmetic number, because the mean of its divisors is an integer number (12799523505).

Almost surely, 2^25599047009 is an apocalyptic number.

It is an amenable number.

25599047009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25599047009 is an equidigital number, since it uses as much as digits as its factorization.

25599047009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 50.

The spelling of 25599047009 in words is "twenty-five billion, five hundred ninety-nine million, forty-seven thousand, nine".