6660642 has 16 divisors (see below), whose sum is σ = 13427712. Its totient is φ = 2202480.

The previous prime is 6660613. The next prime is 6660649. The reversal of 6660642 is 2460666.

It is not an unprimeable number, because it can be changed into a prime (6660649) 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, 3609 + ... + 5132.

It is an arithmetic number, because the mean of its divisors is an integer number (839232).

Almost surely, 2^6660642 is an apocalyptic number.

6660642 is an abundant number, since it is smaller than the sum of its proper divisors (6767070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6660642 is a wasteful number, since it uses less digits than its factorization.

6660642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8873.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6660642 is about 2580.8219620888. The cubic root of 6660642 is about 188.1504944055.

The spelling of 6660642 in words is "six million, six hundred sixty thousand, six hundred forty-two".