666406013 has 8 divisors (see below), whose sum is σ = 820192128. Its totient is φ = 527266224.

The previous prime is 666406009. The next prime is 666406031. The reversal of 666406013 is 310604666.

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 666406013 - 2² = 666406009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666406043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3661481 + ... + 3661662.

It is an arithmetic number, because the mean of its divisors is an integer number (102524016).

Almost surely, 2^666406013 is an apocalyptic number.

It is an amenable number.

666406013 is a deficient number, since it is larger than the sum of its proper divisors (153786115).

666406013 is a wasteful number, since it uses less digits than its factorization.

666406013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323163.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 666406013 is about 25814.8409446969. The cubic root of 666406013 is about 873.4665989196.

The spelling of 666406013 in words is "six hundred sixty-six million, four hundred six thousand, thirteen".