16599965005899 has 48 divisors (see below), whose sum is σ = 27127476754560. Its totient is φ = 10060154976960.

The previous prime is 16599965005739. The next prime is 16599965005969. The reversal of 16599965005899 is 99850056999561.

It is a happy number.

16599965005899 is a `hidden beast` number, since 1 + 6 + 59 + 9 + 9 + 6 + 500 + 58 + 9 + 9 = 666.

16599965005899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16599965005899 - 2¹² = 16599965001803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (16599965005499) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69215239 + ... + 69454655.

It is an arithmetic number, because the mean of its divisors is an integer number (565155765720).

Almost surely, 2^{16599965005899} is an apocalyptic number.

16599965005899 is a deficient number, since it is larger than the sum of its proper divisors (10527511748661).

16599965005899 is a wasteful number, since it uses less digits than its factorization.

16599965005899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265382 (or 265370 counting only the distinct ones).

The product of its (nonzero) digits is 2125764000, while the sum is 81.

The spelling of 16599965005899 in words is "sixteen trillion, five hundred ninety-nine billion, nine hundred sixty-five million, five thousand, eight hundred ninety-nine".