16378686715446 has 128 divisors (see below), whose sum is σ = 40458562214400. Its totient is φ = 4870008000000.

The previous prime is 16378686715439. The next prime is 16378686715471. The reversal of 16378686715446 is 64451768687361.

16378686715446 is a `hidden beast` number, since 1 + 6 + 3 + 7 + 8 + 6 + 8 + 6 + 71 + 544 + 6 = 666.

It is a super-2 number, since 2×16378686715446² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5742946 + ... + 8107946.

It is an arithmetic number, because the mean of its divisors is an integer number (316082517300).

Almost surely, 2^{16378686715446} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16378686715446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20229281107200).

16378686715446 is an abundant number, since it is smaller than the sum of its proper divisors (24079875498954).

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

16378686715446 is a wasteful number, since it uses less digits than its factorization.

16378686715446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365243 (or 2365237 counting only the distinct ones).

The product of its digits is 975421440, while the sum is 72.

The spelling of 16378686715446 in words is "sixteen trillion, three hundred seventy-eight billion, six hundred eighty-six million, seven hundred fifteen thousand, four hundred forty-six".