16686872846520 has 128 divisors (see below), whose sum is σ = 50788130112000. Its totient is φ = 4385220456960.

The previous prime is 16686872846473. The next prime is 16686872846557. The reversal of 16686872846520 is 2564827868661.

It is a super-2 number, since 2×16686872846520² (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 31 ways as a sum of consecutive naturals, for example, 18900291 + ... + 19763469.

It is an arithmetic number, because the mean of its divisors is an integer number (396782266500).

Almost surely, 2^{16686872846520} is an apocalyptic number.

16686872846520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16686872846520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25394065056000).

16686872846520 is an abundant number, since it is smaller than the sum of its proper divisors (34101257265480).

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

16686872846520 is a wasteful number, since it uses less digits than its factorization.

16686872846520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865533 (or 865529 counting only the distinct ones).

The product of its (nonzero) digits is 371589120, while the sum is 69.

The spelling of 16686872846520 in words is "sixteen trillion, six hundred eighty-six billion, eight hundred seventy-two million, eight hundred forty-six thousand, five hundred twenty".