1666518336 has 336 divisors, whose sum is σ = 5748121600. Its totient is φ = 451630080.

The previous prime is 1666518323. The next prime is 1666518361. The reversal of 1666518336 is 6338156661.

It is a tau number, because it is divible by the number of its divisors (336).

It is a junction number, because it is equal to n+sod(n) for n = 1666518291 and 1666518300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8374365 + ... + 8374563.

Almost surely, 2^1666518336 is an apocalyptic number.

1666518336 is a gapful number since it is divisible by the number (16) 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 1666518336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2874060800).

1666518336 is an abundant number, since it is smaller than the sum of its proper divisors (4081603264).

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

1666518336 is a wasteful number, since it uses less digits than its factorization.

1666518336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 309 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1666518336 is about 40823.0123337316. The cubic root of 1666518336 is about 1185.5959273628.

The spelling of 1666518336 in words is "one billion, six hundred sixty-six million, five hundred eighteen thousand, three hundred thirty-six".