16564350991 has 8 divisors (see below), whose sum is σ = 16794086400. Its totient is φ = 16335117240.

The previous prime is 16564350983. The next prime is 16564351003. The reversal of 16564350991 is 19905346561.

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 16564350991 - 2³ = 16564350983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564350191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58675 + ... + 191236.

It is an arithmetic number, because the mean of its divisors is an integer number (2099260800).

Almost surely, 2^16564350991 is an apocalyptic number.

16564350991 is a deficient number, since it is larger than the sum of its proper divisors (229735409).

16564350991 is an equidigital number, since it uses as much as digits as its factorization.

16564350991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250829.

The product of its (nonzero) digits is 874800, while the sum is 49.

The spelling of 16564350991 in words is "sixteen billion, five hundred sixty-four million, three hundred fifty thousand, nine hundred ninety-one".