16670721404454 has 128 divisors (see below), whose sum is σ = 36375076953600. Its totient is φ = 5062855311360.

The previous prime is 16670721404429. The next prime is 16670721404531. The reversal of 16670721404454 is 45440412707661.

It is a junction number, because it is equal to n+sod(n) for n = 16670721404397 and 16670721404406.

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, 6199597542 + ... + 6199600230.

It is an arithmetic number, because the mean of its divisors is an integer number (284180288700).

Almost surely, 2^{16670721404454} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16670721404454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18187538476800).

16670721404454 is an abundant number, since it is smaller than the sum of its proper divisors (19704355549146).

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

16670721404454 is a wasteful number, since it uses less digits than its factorization.

16670721404454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350.

The product of its (nonzero) digits is 4515840, while the sum is 51.

The spelling of 16670721404454 in words is "sixteen trillion, six hundred seventy billion, seven hundred twenty-one million, four hundred four thousand, four hundred fifty-four".