1666104768 has 112 divisors (see below), whose sum is σ = 4916789760. Its totient is φ = 553243392.

The previous prime is 1666104721. The next prime is 1666104779. The reversal of 1666104768 is 8674016661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487321 + ... + 490727.

Almost surely, 2^1666104768 is an apocalyptic number.

1666104768 is a gapful number since it is divisible by the number (18) 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 1666104768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2458394880).

1666104768 is an abundant number, since it is smaller than the sum of its proper divisors (3250684992).

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

1666104768 is a wasteful number, since it uses less digits than its factorization.

1666104768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1666104768 is about 40817.9466411528. The cubic root of 1666104768 is about 1185.4978456133.

The spelling of 1666104768 in words is "one billion, six hundred sixty-six million, one hundred four thousand, seven hundred sixty-eight".