6635659 has 2 divisors, whose sum is σ = 6635660. Its totient is φ = 6635658.

The previous prime is 6635633. The next prime is 6635663. The reversal of 6635659 is 9565366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6635659 - 2¹⁷ = 6504587 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6635609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3317829 + 3317830.

It is an arithmetic number, because the mean of its divisors is an integer number (3317830).

Almost surely, 2^6635659 is an apocalyptic number.

6635659 is a deficient number, since it is larger than the sum of its proper divisors (1).

6635659 is an equidigital number, since it uses as much as digits as its factorization.

6635659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 40.

The square root of 6635659 is about 2575.9772902726. The cubic root of 6635659 is about 187.9149588971.

The spelling of 6635659 in words is "six million, six hundred thirty-five thousand, six hundred fifty-nine".