12540345406 has 4 divisors (see below), whose sum is σ = 18810518112. Its totient is φ = 6270172702.

The previous prime is 12540345397. The next prime is 12540345427. The reversal of 12540345406 is 60454304521.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3135086350 + ... + 3135086353.

It is an arithmetic number, because the mean of its divisors is an integer number (4702629528).

Almost surely, 2^12540345406 is an apocalyptic number.

12540345406 is a deficient number, since it is larger than the sum of its proper divisors (6270172706).

12540345406 is an equidigital number, since it uses as much as digits as its factorization.

12540345406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6270172705.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 12540345406 its reverse (60454304521), we get a palindrome (72994649927).

The spelling of 12540345406 in words is "twelve billion, five hundred forty million, three hundred forty-five thousand, four hundred six".