1666357632 has 192 divisors, whose sum is σ = 5123664000. Its totient is φ = 518676480.

The previous prime is 1666357619. The next prime is 1666357643. The reversal of 1666357632 is 2367536661.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1034844 + ... + 1036452.

It is an arithmetic number, because the mean of its divisors is an integer number (26685750).

Almost surely, 2^1666357632 is an apocalyptic number.

1666357632 is a gapful number since it is divisible by the number (12) 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 1666357632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2561832000).

1666357632 is an abundant number, since it is smaller than the sum of its proper divisors (3457306368).

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

1666357632 is a wasteful number, since it uses less digits than its factorization.

1666357632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1674 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 1666357632 is about 40821.0439846901. The cubic root of 1666357632 is about 1185.5578167445.

The spelling of 1666357632 in words is "one billion, six hundred sixty-six million, three hundred fifty-seven thousand, six hundred thirty-two".