12540204345 has 32 divisors (see below), whose sum is σ = 21127219200. Its totient is φ = 6334041024.

The previous prime is 12540204311. The next prime is 12540204349. The reversal of 12540204345 is 54340204521.

It is not a de Polignac number, because 12540204345 - 2¹² = 12540200249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12540204349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1267026 + ... + 1276884.

It is an arithmetic number, because the mean of its divisors is an integer number (660225600).

Almost surely, 2^12540204345 is an apocalyptic number.

12540204345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12540204345 is a deficient number, since it is larger than the sum of its proper divisors (8587014855).

12540204345 is a wasteful number, since it uses less digits than its factorization.

12540204345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14349.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 12540204345 its reverse (54340204521), we get a palindrome (66880408866).

The spelling of 12540204345 in words is "twelve billion, five hundred forty million, two hundred four thousand, three hundred forty-five".