16660444356520 has 32 divisors (see below), whose sum is σ = 38695225605120. Its totient is φ = 6449204266560.

The previous prime is 16660444356487. The next prime is 16660444356541. The reversal of 16660444356520 is 2565344406661.

It is a super-3 number, since 3×16660444356520³ (a number of 41 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6717919872 + ... + 6717922351.

It is an arithmetic number, because the mean of its divisors is an integer number (1209225800160).

Almost surely, 2^{16660444356520} is an apocalyptic number.

16660444356520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16660444356520 is an abundant number, since it is smaller than the sum of its proper divisors (22034781248600).

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

16660444356520 is a wasteful number, since it uses less digits than its factorization.

16660444356520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13435842265 (or 13435842261 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 16660444356520 in words is "sixteen trillion, six hundred sixty billion, four hundred forty-four million, three hundred fifty-six thousand, five hundred twenty".