1666344240 has 360 divisors, whose sum is σ = 6359842944. Its totient is φ = 390297600.

The previous prime is 1666344193. The next prime is 1666344269. The reversal of 1666344240 is 424436661.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1666344195 and 1666344204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2700412 + ... + 2701028.

Almost surely, 2^1666344240 is an apocalyptic number.

1666344240 is a gapful number since it is divisible by the number (10) 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 1666344240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3179921472).

1666344240 is an abundant number, since it is smaller than the sum of its proper divisors (4693498704).

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

1666344240 is a wasteful number, since it uses less digits than its factorization.

1666344240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 1666344240 is about 40820.8799513190. The cubic root of 1666344240 is about 1185.5546407491.

The spelling of 1666344240 in words is "one billion, six hundred sixty-six million, three hundred forty-four thousand, two hundred forty".