999999659 has 8 divisors (see below), whose sum is σ = 1052934480. Its totient is φ = 947095200.

The previous prime is 999999613. The next prime is 999999667. The reversal of 999999659 is 956999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999059) 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, 97349 + ... + 107129.

It is an arithmetic number, because the mean of its divisors is an integer number (131616810).

Almost surely, 2^999999659 is an apocalyptic number.

999999659 is a deficient number, since it is larger than the sum of its proper divisors (52934821).

999999659 is a wasteful number, since it uses less digits than its factorization.

999999659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15181.

The product of its digits is 143489070, while the sum is 74.

The square root of 999999659 is about 31622.7712099999. The cubic root of 999999659 is about 999.9998863333. Note that the first 3 decimals are identical.

The spelling of 999999659 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred fifty-nine".