16666040384 has 56 divisors (see below), whose sum is σ = 37935944448. Its totient is φ = 7116180480.

The previous prime is 16666040297. The next prime is 16666040441. The reversal of 16666040384 is 48304066661.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×16666040384² (a number of 21 digits) contains 22 as substring.

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, 52772 + ... + 190044.

Almost surely, 2^16666040384 is an apocalyptic number.

16666040384 is a gapful number since it is divisible by the number (14) 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 16666040384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18967972224).

16666040384 is an abundant number, since it is smaller than the sum of its proper divisors (21269904064).

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

16666040384 is a wasteful number, since it uses less digits than its factorization.

16666040384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137563 (or 137553 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 16666040384 in words is "sixteen billion, six hundred sixty-six million, forty thousand, three hundred eighty-four".