16121274016644 has 144 divisors (see below), whose sum is σ = 42356607471360. Its totient is φ = 5166195540480.

The previous prime is 16121274016637. The next prime is 16121274016663. The reversal of 16121274016644 is 44661047212161.

16121274016644 is a `hidden beast` number, since 1 + 6 + 121 + 27 + 401 + 66 + 44 = 666.

16121274016644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16121274016644.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47486469 + ... + 47824755.

It is an arithmetic number, because the mean of its divisors is an integer number (294143107440).

Almost surely, 2^{16121274016644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16121274016644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21178303735680).

16121274016644 is an abundant number, since it is smaller than the sum of its proper divisors (26235333454716).

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

16121274016644 is a wasteful number, since it uses less digits than its factorization.

16121274016644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338810 (or 338805 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 16121274016644 in words is "sixteen trillion, one hundred twenty-one billion, two hundred seventy-four million, sixteen thousand, six hundred forty-four".