12800640550 has 12 divisors (see below), whose sum is σ = 23809191516. Its totient is φ = 5120256200.

The previous prime is 12800640539. The next prime is 12800640553. The reversal of 12800640550 is 5504600821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12800640553) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 128006356 + ... + 128006455.

It is an arithmetic number, because the mean of its divisors is an integer number (1984099293).

Almost surely, 2^12800640550 is an apocalyptic number.

12800640550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12800640550 is a deficient number, since it is larger than the sum of its proper divisors (11008550966).

12800640550 is a wasteful number, since it uses less digits than its factorization.

12800640550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256012823 (or 256012818 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 12800640550 in words is "twelve billion, eight hundred million, six hundred forty thousand, five hundred fifty".