25040405009 has 4 divisors (see below), whose sum is σ = 25049347620. Its totient is φ = 25031462400.

The previous prime is 25040404997. The next prime is 25040405053. The reversal of 25040405009 is 90050404052.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20398980625 + 4641424384 = 142825^2 + 68128^2 .

It is a cyclic number.

It is not a de Polignac number, because 25040405009 - 2⁴ = 25040404993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25040405099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4467104 + ... + 4472705.

It is an arithmetic number, because the mean of its divisors is an integer number (6262336905).

Almost surely, 2^25040405009 is an apocalyptic number.

It is an amenable number.

25040405009 is a deficient number, since it is larger than the sum of its proper divisors (8942611).

25040405009 is an equidigital number, since it uses as much as digits as its factorization.

25040405009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8942610.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 25040405009 in words is "twenty-five billion, forty million, four hundred five thousand, nine".