16556221111055 has 8 divisors (see below), whose sum is σ = 19867730046144. Its totient is φ = 13244800413600.

The previous prime is 16556221111049. The next prime is 16556221111093. The reversal of 16556221111055 is 55011112265561.

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

It is not a de Polignac number, because 16556221111055 - 2⁶ = 16556221110991 is a prime.

It is a Duffinian number.

It is a congruent 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, 21645911 + ... + 22397720.

It is an arithmetic number, because the mean of its divisors is an integer number (2483466255768).

Almost surely, 2^{16556221111055} is an apocalyptic number.

16556221111055 is a deficient number, since it is larger than the sum of its proper divisors (3311508935089).

16556221111055 is an equidigital number, since it uses as much as digits as its factorization.

16556221111055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44118817.

The product of its (nonzero) digits is 90000, while the sum is 41.

The spelling of 16556221111055 in words is "sixteen trillion, five hundred fifty-six billion, two hundred twenty-one million, one hundred eleven thousand, fifty-five".