12540494057536 has 63 divisors (see below), whose sum is σ = 25007122684791. Its totient is φ = 6239636411904.

The previous prime is 12540494057383. The next prime is 12540494057537. The reversal of 12540494057536 is 63575049404521.

The square root of 12540494057536 is 3541256.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5270697640000 + 7269796417536 = 2295800^2 + 2696256^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12540494057537) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6487580026 + ... + 6487581958.

Almost surely, 2^{12540494057536} is an apocalyptic number.

12540494057536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

12540494057536 is the 3541256-th square number.

It is an amenable number.

12540494057536 is a deficient number, since it is larger than the sum of its proper divisors (12466628627255).

12540494057536 is an frugal number, since it uses more digits than its factorization.

12540494057536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 12540494057536 in words is "twelve trillion, five hundred forty billion, four hundred ninety-four million, fifty-seven thousand, five hundred thirty-six".