12991853789945 has 32 divisors (see below), whose sum is σ = 15940183843584. Its totient is φ = 10162862208000.

The previous prime is 12991853789939. The next prime is 12991853789951. The reversal of 12991853789945 is 54998735819921.

It is an interprime number because it is at equal distance from previous prime (12991853789939) and next prime (12991853789951).

It is not a de Polignac number, because 12991853789945 - 2⁶ = 12991853789881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12991853789945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76899365 + ... + 77068125.

It is an arithmetic number, because the mean of its divisors is an integer number (498130745112).

Almost surely, 2^{12991853789945} is an apocalyptic number.

It is an amenable number.

12991853789945 is a deficient number, since it is larger than the sum of its proper divisors (2948330053639).

12991853789945 is a wasteful number, since it uses less digits than its factorization.

12991853789945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170753.

The product of its digits is 1763596800, while the sum is 80.

The spelling of 12991853789945 in words is "twelve trillion, nine hundred ninety-one billion, eight hundred fifty-three million, seven hundred eighty-nine thousand, nine hundred forty-five".