11978321429856 has 96 divisors (see below), whose sum is σ = 32495043919968. Its totient is φ = 3860916469760.

The previous prime is 11978321429813. The next prime is 11978321429869. The reversal of 11978321429856 is 65892412387911.

It is a tau number, because it is divible by the number of its divisors (96).

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 15 ways as a sum of consecutive naturals, for example, 13021041 + ... + 13910576.

It is an arithmetic number, because the mean of its divisors is an integer number (338490040833).

Almost surely, 2^{11978321429856} is an apocalyptic number.

11978321429856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11978321429856 is an abundant number, since it is smaller than the sum of its proper divisors (20516722490112).

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

11978321429856 is a wasteful number, since it uses less digits than its factorization.

11978321429856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26931784 (or 26931776 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 66.

The spelling of 11978321429856 in words is "eleven trillion, nine hundred seventy-eight billion, three hundred twenty-one million, four hundred twenty-nine thousand, eight hundred fifty-six".