12405440025 has 36 divisors (see below), whose sum is σ = 24239482800. Its totient is φ = 6014757600.

The previous prime is 12405440023. The next prime is 12405440087. The reversal of 12405440025 is 52004450421.

It is not a de Polignac number, because 12405440025 - 2¹ = 12405440023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12405440023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2503675 + ... + 2508624.

Almost surely, 2^12405440025 is an apocalyptic number.

12405440025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12405440025 is a deficient number, since it is larger than the sum of its proper divisors (11834042775).

12405440025 is a wasteful number, since it uses less digits than its factorization.

12405440025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012326 (or 5012318 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 12405440025 its reverse (52004450421), we get a palindrome (64409890446).

The spelling of 12405440025 in words is "twelve billion, four hundred five million, four hundred forty thousand, twenty-five".