6660859 has 2 divisors, whose sum is σ = 6660860. Its totient is φ = 6660858.

The previous prime is 6660809. The next prime is 6660911. The reversal of 6660859 is 9580666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6660859 - 2⁹ = 6660347 is a prime.

It is not a weakly prime, because it can be changed into another prime (6660809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330429 + 3330430.

It is an arithmetic number, because the mean of its divisors is an integer number (3330430).

Almost surely, 2^6660859 is an apocalyptic number.

6660859 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660859 is an equidigital number, since it uses as much as digits as its factorization.

6660859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 6660859 is about 2580.8640026162. The cubic root of 6660859 is about 188.1525376627.

The spelling of 6660859 in words is "six million, six hundred sixty thousand, eight hundred fifty-nine".