16566404155 has 8 divisors (see below), whose sum is σ = 22719640032. Its totient is φ = 11359819968.

The previous prime is 16566404147. The next prime is 16566404203. The reversal of 16566404155 is 55140466561.

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

It is not a de Polignac number, because 16566404155 - 2³ = 16566404147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236662882 + ... + 236662951.

It is an arithmetic number, because the mean of its divisors is an integer number (2839955004).

Almost surely, 2^16566404155 is an apocalyptic number.

16566404155 is a deficient number, since it is larger than the sum of its proper divisors (6153235877).

16566404155 is an equidigital number, since it uses as much as digits as its factorization.

16566404155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473325845.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 16566404155 in words is "sixteen billion, five hundred sixty-six million, four hundred four thousand, one hundred fifty-five".