16986781720 has 64 divisors (see below), whose sum is σ = 38786454720. Its totient is φ = 6694262784.

The previous prime is 16986781681. The next prime is 16986781727. The reversal of 16986781720 is 2718768961.

It is a super-3 number, since 3×16986781720³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16986781727) by changing a digit.

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, 3200589 + ... + 3205891.

It is an arithmetic number, because the mean of its divisors is an integer number (606038355).

Almost surely, 2^16986781720 is an apocalyptic number.

16986781720 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 16986781720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19393227360).

16986781720 is an abundant number, since it is smaller than the sum of its proper divisors (21799673000).

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

16986781720 is a wasteful number, since it uses less digits than its factorization.

16986781720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6484 (or 6480 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 16986781720 in words is "sixteen billion, nine hundred eighty-six million, seven hundred eighty-one thousand, seven hundred twenty".