16599965005981 has 8 divisors (see below), whose sum is σ = 18971423737280. Its totient is φ = 14228515064448.

The previous prime is 16599965005979. The next prime is 16599965006021. The reversal of 16599965005981 is 18950056999561.

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

It is a cyclic number.

It is not a de Polignac number, because 16599965005981 - 2¹ = 16599965005979 is a prime.

It is a super-2 number, since 2×16599965005981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16599965005181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526490 + ... + 6291508.

It is an arithmetic number, because the mean of its divisors is an integer number (2371427967160).

Almost surely, 2^{16599965005981} is an apocalyptic number.

It is an amenable number.

16599965005981 is a deficient number, since it is larger than the sum of its proper divisors (2371458731299).

16599965005981 is an equidigital number, since it uses as much as digits as its factorization.

16599965005981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394883.

The product of its (nonzero) digits is 236196000, while the sum is 73.

The spelling of 16599965005981 in words is "sixteen trillion, five hundred ninety-nine billion, nine hundred sixty-five million, five thousand, nine hundred eighty-one".