6666493 has 4 divisors (see below), whose sum is σ = 6673888. Its totient is φ = 6659100.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666493 is 3946666.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666493 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 (6666593) 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, 2121 + ... + 4222.

It is an arithmetic number, because the mean of its divisors is an integer number (1668472).

Almost surely, 2^6666493 is an apocalyptic number.

It is an amenable number.

6666493 is a deficient number, since it is larger than the sum of its proper divisors (7395).

6666493 is a wasteful number, since it uses less digits than its factorization.

6666493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7394.

The product of its digits is 139968, while the sum is 40.

The square root of 6666493 is about 2581.9552668472. The cubic root of 6666493 is about 188.2055714961.

The spelling of 6666493 in words is "six million, six hundred sixty-six thousand, four hundred ninety-three".