12991853789946 has 80 divisors (see below), whose sum is σ = 30625644693600. Its totient is φ = 4110416930592.

The previous prime is 12991853789939. The next prime is 12991853789951. The reversal of 12991853789946 is 64998735819921.

12991853789946 is a `hidden beast` number, since 1 + 29 + 9 + 18 + 537 + 8 + 9 + 9 + 46 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

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 39 ways as a sum of consecutive naturals, for example, 23158420 + ... + 23712783.

It is an arithmetic number, because the mean of its divisors is an integer number (382820558670).

Almost surely, 2^{12991853789946} is an apocalyptic number.

12991853789946 is an abundant number, since it is smaller than the sum of its proper divisors (17633790903654).

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

12991853789946 is a wasteful number, since it uses less digits than its factorization.

12991853789946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46871305 (or 46871296 counting only the distinct ones).

The product of its digits is 2116316160, while the sum is 81.

The spelling of 12991853789946 in words is "twelve trillion, nine hundred ninety-one billion, eight hundred fifty-three million, seven hundred eighty-nine thousand, nine hundred forty-six".