16660065555 has 64 divisors (see below), whose sum is σ = 34636293120. Its totient is φ = 7438894848.

The previous prime is 16660065553. The next prime is 16660065577. The reversal of 16660065555 is 55556006661.

It is not a de Polignac number, because 16660065555 - 2¹ = 16660065553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16660065555.

It is not an unprimeable number, because it can be changed into a prime (16660065553) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 164362 + ... + 245631.

It is an arithmetic number, because the mean of its divisors is an integer number (541192080).

Almost surely, 2^16660065555 is an apocalyptic number.

16660065555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16660065555 is an abundant number, since it is smaller than the sum of its proper divisors (17976227565).

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

16660065555 is a wasteful number, since it uses less digits than its factorization.

16660065555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410057 (or 410051 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 16660065555 in words is "sixteen billion, six hundred sixty million, sixty-five thousand, five hundred fifty-five".