1666313 has 4 divisors (see below), whose sum is σ = 1817808. Its totient is φ = 1514820.

The previous prime is 1666309. The next prime is 1666321. The reversal of 1666313 is 3136661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3136661 = 11 ⋅285151.

It is a cyclic number.

It is not a de Polignac number, because 1666313 - 2² = 1666309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75731 + ... + 75752.

It is an arithmetic number, because the mean of its divisors is an integer number (454452).

2^1666313 is an apocalyptic number.

It is an amenable number.

1666313 is a deficient number, since it is larger than the sum of its proper divisors (151495).

1666313 is a wasteful number, since it uses less digits than its factorization.

1666313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151494.

The product of its digits is 1944, while the sum is 26.

The square root of 1666313 is about 1290.8574669575. The cubic root of 1666313 is about 118.5547231924.

The spelling of 1666313 in words is "one million, six hundred sixty-six thousand, three hundred thirteen".