12543975550 has 24 divisors (see below), whose sum is σ = 23379749136. Its totient is φ = 5007277440.

The previous prime is 12543975533. The next prime is 12543975557. The reversal of 12543975550 is 5557934521.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 12543975550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543975557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233227 + ... + 281926.

It is an arithmetic number, because the mean of its divisors is an integer number (974156214).

Almost surely, 2^12543975550 is an apocalyptic number.

12543975550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12543975550 is a deficient number, since it is larger than the sum of its proper divisors (10835773586).

12543975550 is a wasteful number, since it uses less digits than its factorization.

12543975550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515652 (or 515647 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 46.

The spelling of 12543975550 in words is "twelve billion, five hundred forty-three million, nine hundred seventy-five thousand, five hundred fifty".