1666344241 has 8 divisors (see below), whose sum is σ = 1687753800. Its totient is φ = 1644994560.

The previous prime is 1666344193. The next prime is 1666344269. The reversal of 1666344241 is 1424436661.

It can be written as a sum of positive squares in 4 ways, for example, as 275427216 + 1390917025 = 16596^2 + 37295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666344241 - 2²⁹ = 1129473329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666344241.

It is not an unprimeable number, because it can be changed into a prime (1666344541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42445 + ... + 71653.

It is an arithmetic number, because the mean of its divisors is an integer number (210969225).

Almost surely, 2^1666344241 is an apocalyptic number.

It is an amenable number.

1666344241 is a deficient number, since it is larger than the sum of its proper divisors (21409559).

1666344241 is an equidigital number, since it uses as much as digits as its factorization.

1666344241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29939.

The product of its digits is 82944, while the sum is 37.

The square root of 1666344241 is about 40820.8799635677. The cubic root of 1666344241 is about 1185.5546409862.

The spelling of 1666344241 in words is "one billion, six hundred sixty-six million, three hundred forty-four thousand, two hundred forty-one".