12991445584654 has 4 divisors (see below), whose sum is σ = 19487168376984. Its totient is φ = 6495722792326.

The previous prime is 12991445584643. The next prime is 12991445584681. The reversal of 12991445584654 is 45648554419921.

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

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 12991445584654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3247861396162 + ... + 3247861396165.

It is an arithmetic number, because the mean of its divisors is an integer number (4871792094246).

Almost surely, 2^{12991445584654} is an apocalyptic number.

12991445584654 is a deficient number, since it is larger than the sum of its proper divisors (6495722792330).

12991445584654 is an equidigital number, since it uses as much as digits as its factorization.

12991445584654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495722792329.

The product of its digits is 248832000, while the sum is 67.

The spelling of 12991445584654 in words is "twelve trillion, nine hundred ninety-one billion, four hundred forty-five million, five hundred eighty-four thousand, six hundred fifty-four".