16554221959 has 8 divisors (see below), whose sum is σ = 18178750080. Its totient is φ = 14949627000.

The previous prime is 16554221939. The next prime is 16554221987. The reversal of 16554221959 is 95912245561.

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

It is not a de Polignac number, because 16554221959 - 2¹⁵ = 16554189191 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 (16554221909) 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 7 ways as a sum of consecutive naturals, for example, 4981549 + ... + 4984870.

It is an arithmetic number, because the mean of its divisors is an integer number (2272343760).

Almost surely, 2^16554221959 is an apocalyptic number.

16554221959 is a deficient number, since it is larger than the sum of its proper divisors (1624528121).

16554221959 is a wasteful number, since it uses less digits than its factorization.

16554221959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9966581.

The product of its digits is 972000, while the sum is 49.

The spelling of 16554221959 in words is "sixteen billion, five hundred fifty-four million, two hundred twenty-one thousand, nine hundred fifty-nine".