16659309585 has 16 divisors (see below), whose sum is σ = 26658202176. Its totient is φ = 8883862848.

The previous prime is 16659309581. The next prime is 16659309587. The reversal of 16659309585 is 58590395661.

It is a happy number.

It is not a de Polignac number, because 16659309585 - 2² = 16659309581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16659309581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64362 + ... + 193548.

It is an arithmetic number, because the mean of its divisors is an integer number (1666137636).

Almost surely, 2^16659309585 is an apocalyptic number.

16659309585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16659309585 is a deficient number, since it is larger than the sum of its proper divisors (9998892591).

16659309585 is a wasteful number, since it uses less digits than its factorization.

16659309585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137792.

The product of its (nonzero) digits is 8748000, while the sum is 57.

The spelling of 16659309585 in words is "sixteen billion, six hundred fifty-nine million, three hundred nine thousand, five hundred eighty-five".