1666746368 has 144 divisors (see below), whose sum is σ = 4109037660. Its totient is φ = 671612928.

The previous prime is 1666746311. The next prime is 1666746373. The reversal of 1666746368 is 8636476661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1399358464 + 267387904 = 37408^2 + 16352^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1705496 + ... + 1706472.

Almost surely, 2^1666746368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666746368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054518830).

1666746368 is an abundant number, since it is smaller than the sum of its proper divisors (2442291292).

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

1666746368 is an equidigital number, since it uses as much as digits as its factorization.

1666746368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1003 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 53.

The square root of 1666746368 is about 40825.8051727091. The cubic root of 1666746368 is about 1185.6500004714.

The spelling of 1666746368 in words is "one billion, six hundred sixty-six million, seven hundred forty-six thousand, three hundred sixty-eight".