16991594947 has 4 divisors (see below), whose sum is σ = 17077846896. Its totient is φ = 16905343000.

The previous prime is 16991594909. The next prime is 16991594951. The reversal of 16991594947 is 74949519961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16991594947 - 2¹¹ = 16991592899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16991594447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43125679 + ... + 43126072.

It is an arithmetic number, because the mean of its divisors is an integer number (4269461724).

Almost surely, 2^16991594947 is an apocalyptic number.

16991594947 is a deficient number, since it is larger than the sum of its proper divisors (86251949).

16991594947 is an equidigital number, since it uses as much as digits as its factorization.

16991594947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86251948.

The product of its digits is 22044960, while the sum is 64.

The spelling of 16991594947 in words is "sixteen billion, nine hundred ninety-one million, five hundred ninety-four thousand, nine hundred forty-seven".