12720166550 has 96 divisors (see below), whose sum is σ = 30652204800. Its totient is φ = 3813816960.

The previous prime is 12720166541. The next prime is 12720166553. The reversal of 12720166550 is 5566102721.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 12720166550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720166553) 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 47 ways as a sum of consecutive naturals, for example, 12881 + ... + 160019.

It is an arithmetic number, because the mean of its divisors is an integer number (319293800).

Almost surely, 2^12720166550 is an apocalyptic number.

12720166550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12720166550 is an abundant number, since it is smaller than the sum of its proper divisors (17932038250).

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

12720166550 is a wasteful number, since it uses less digits than its factorization.

12720166550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147190 (or 147185 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 12720166550 in words is "twelve billion, seven hundred twenty million, one hundred sixty-six thousand, five hundred fifty".