12540140644 has 24 divisors (see below), whose sum is σ = 23241222648. Its totient is φ = 5899952640.

The previous prime is 12540140623. The next prime is 12540140651. The reversal of 12540140644 is 44604104521.

It can be written as a sum of positive squares in 4 ways, for example, as 2721708900 + 9818431744 = 52170^2 + 99088^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 340222 + ... + 375274.

It is an arithmetic number, because the mean of its divisors is an integer number (968384277).

Almost surely, 2^12540140644 is an apocalyptic number.

It is an amenable number.

12540140644 is a deficient number, since it is larger than the sum of its proper divisors (10701082004).

12540140644 is a wasteful number, since it uses less digits than its factorization.

12540140644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40335 (or 40333 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The spelling of 12540140644 in words is "twelve billion, five hundred forty million, one hundred forty thousand, six hundred forty-four".