12554666645521 has 16 divisors (see below), whose sum is σ = 16856615357568. Its totient is φ = 9030329654400.

The previous prime is 12554666645513. The next prime is 12554666645533.

12554666645521 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12554666645521 - 2³ = 12554666645513 is a prime.

It is a super-2 number, since 2×12554666645521² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12554666645021) 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 15 ways as a sum of consecutive naturals, for example, 6271061260 + ... + 6271063261.

It is an arithmetic number, because the mean of its divisors is an integer number (1053538459848).

Almost surely, 2^{12554666645521} is an apocalyptic number.

12554666645521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12554666645521 is a deficient number, since it is larger than the sum of its proper divisors (4301948712047).

12554666645521 is a wasteful number, since it uses less digits than its factorization.

12554666645521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12542124552.

The product of its digits is 51840000, while the sum is 58.

The spelling of 12554666645521 in words is "twelve trillion, five hundred fifty-four billion, six hundred sixty-six million, six hundred forty-five thousand, five hundred twenty-one".