1666340013 has 8 divisors (see below), whose sum is σ = 2392693408. Its totient is φ = 1025439984.

The previous prime is 1666340003. The next prime is 1666340023. The reversal of 1666340013 is 3100436661.

It is an interprime number because it is at equal distance from previous prime (1666340003) and next prime (1666340023).

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

It is not a de Polignac number, because 1666340013 - 2²⁹ = 1129469101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666340003) 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, 21363295 + ... + 21363372.

It is an arithmetic number, because the mean of its divisors is an integer number (299086676).

Almost surely, 2^1666340013 is an apocalyptic number.

1666340013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1666340013 is a deficient number, since it is larger than the sum of its proper divisors (726353395).

1666340013 is a wasteful number, since it uses less digits than its factorization.

1666340013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42726683.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1666340013 is about 40820.8281763122. The cubic root of 1666340013 is about 1185.5536382864.

Adding to 1666340013 its reverse (3100436661), we get a palindrome (4766776674).

The spelling of 1666340013 in words is "one billion, six hundred sixty-six million, three hundred forty thousand, thirteen".