6660047 has 4 divisors (see below), whose sum is σ = 6669936. Its totient is φ = 6650160.

The previous prime is 6660029. The next prime is 6660061. The reversal of 6660047 is 7400666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6660047 - 2¹² = 6655951 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660347) 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, 3854 + ... + 5307.

It is an arithmetic number, because the mean of its divisors is an integer number (1667484).

Almost surely, 2^6660047 is an apocalyptic number.

6660047 is a deficient number, since it is larger than the sum of its proper divisors (9889).

6660047 is an equidigital number, since it uses as much as digits as its factorization.

6660047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9888.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 6660047 is about 2580.7066861618. The cubic root of 6660047 is about 188.1448916984.

The spelling of 6660047 in words is "six million, six hundred sixty thousand, forty-seven".