12811061555 has 4 divisors (see below), whose sum is σ = 15373273872. Its totient is φ = 10248849240.

The previous prime is 12811061539. The next prime is 12811061561. The reversal of 12811061555 is 55516011821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12811061555 - 2⁴ = 12811061539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1281106151 + ... + 1281106160.

It is an arithmetic number, because the mean of its divisors is an integer number (3843318468).

Almost surely, 2^12811061555 is an apocalyptic number.

12811061555 is a deficient number, since it is larger than the sum of its proper divisors (2562212317).

12811061555 is an equidigital number, since it uses as much as digits as its factorization.

12811061555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562212316.

The product of its (nonzero) digits is 12000, while the sum is 35.

The spelling of 12811061555 in words is "twelve billion, eight hundred eleven million, sixty-one thousand, five hundred fifty-five".