12540243066 has 32 divisors (see below), whose sum is σ = 27351663360. Its totient is φ = 3809692224.

The previous prime is 12540243059. The next prime is 12540243083. The reversal of 12540243066 is 66034204521.

It is a super-2 number, since 2×12540243066² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011385 + ... + 1023708.

It is an arithmetic number, because the mean of its divisors is an integer number (854739480).

Almost surely, 2^12540243066 is an apocalyptic number.

12540243066 is an abundant number, since it is smaller than the sum of its proper divisors (14811420294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12540243066 is a wasteful number, since it uses less digits than its factorization.

12540243066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035190.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 12540243066 its reverse (66034204521), we get a palindrome (78574447587).

The spelling of 12540243066 in words is "twelve billion, five hundred forty million, two hundred forty-three thousand, sixty-six".