12556212320555 has 16 divisors (see below), whose sum is σ = 15155062480800. Its totient is φ = 9986590149120.

The previous prime is 12556212320543. The next prime is 12556212320623. The reversal of 12556212320555 is 55502321265521.

It is a happy number.

It is not a de Polignac number, because 12556212320555 - 2⁴ = 12556212320539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2370131 + ... + 5543459.

It is an arithmetic number, because the mean of its divisors is an integer number (947191405050).

Almost surely, 2^{12556212320555} is an apocalyptic number.

12556212320555 is a deficient number, since it is larger than the sum of its proper divisors (2598850160245).

12556212320555 is a wasteful number, since it uses less digits than its factorization.

12556212320555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177934.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 12556212320555 in words is "twelve trillion, five hundred fifty-six billion, two hundred twelve million, three hundred twenty thousand, five hundred fifty-five".