16661017870960 has 80 divisors (see below), whose sum is σ = 39310624851840. Its totient is φ = 6565896529920.

The previous prime is 16661017870949. The next prime is 16661017871087. The reversal of 16661017870960 is 6907871016661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×16661017870960² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16661017870895 and 16661017870904.

It is a congruent number.

It is an unprimeable number.

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, 3754426 + ... + 6886054.

It is an arithmetic number, because the mean of its divisors is an integer number (491382810648).

Almost surely, 2^{16661017870960} is an apocalyptic number.

16661017870960 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 16661017870960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19655312425920).

16661017870960 is an abundant number, since it is smaller than the sum of its proper divisors (22649606980880).

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

16661017870960 is a wasteful number, since it uses less digits than its factorization.

16661017870960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132626 (or 3132620 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 16661017870960 in words is "sixteen trillion, six hundred sixty-one billion, seventeen million, eight hundred seventy thousand, nine hundred sixty".