12611780561280 has 64 divisors (see below), whose sum is σ = 40200050545200. Its totient is φ = 3363141482496.

The previous prime is 12611780561267. The next prime is 12611780561297. The reversal of 12611780561280 is 8216508711621.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3284315935 + ... + 3284319774.

Almost surely, 2^{12611780561280} is an apocalyptic number.

12611780561280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12611780561280 is an abundant number, since it is smaller than the sum of its proper divisors (27588269983920).

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

12611780561280 is an equidigital number, since it uses as much as digits as its factorization.

12611780561280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568635731 (or 6568635719 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 12611780561280 in words is "twelve trillion, six hundred eleven billion, seven hundred eighty million, five hundred sixty-one thousand, two hundred eighty".