16661120303172 has 96 divisors (see below), whose sum is σ = 41358886307200. Its totient is φ = 5205385285632.

The previous prime is 16661120303159. The next prime is 16661120303197. The reversal of 16661120303172 is 27130302116661.

It is a super-3 number, since 3×16661120303172³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16661120303172.

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, 16227318 + ... + 17223474.

Almost surely, 2^{16661120303172} is an apocalyptic number.

16661120303172 is a gapful number since it is divisible by the number (12) 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 16661120303172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20679443153600).

16661120303172 is an abundant number, since it is smaller than the sum of its proper divisors (24697766004028).

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

16661120303172 is a wasteful number, since it uses less digits than its factorization.

16661120303172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996965 (or 996963 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 16661120303172 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty million, three hundred three thousand, one hundred seventy-two".