12720120555 has 16 divisors (see below), whose sum is σ = 20357743104. Its totient is φ = 6782214240.

The previous prime is 12720120541. The next prime is 12720120557. The reversal of 12720120555 is 55502102721.

It is not a de Polignac number, because 12720120555 - 2¹² = 12720116459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12720120557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57861 + ... + 169670.

It is an arithmetic number, because the mean of its divisors is an integer number (1272358944).

Almost surely, 2^12720120555 is an apocalyptic number.

12720120555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12720120555 is a deficient number, since it is larger than the sum of its proper divisors (7637622549).

12720120555 is a wasteful number, since it uses less digits than its factorization.

12720120555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231266.

The product of its (nonzero) digits is 7000, while the sum is 30.

The spelling of 12720120555 in words is "twelve billion, seven hundred twenty million, one hundred twenty thousand, five hundred fifty-five".