16555166155561 has 16 divisors (see below), whose sum is σ = 18068056473600. Its totient is φ = 15043589896720.

The previous prime is 16555166155529. The next prime is 16555166155691.

16555166155561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16555166155561 - 2⁵ = 16555166155529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16555166155496 and 16555166155505.

It is not an unprimeable number, because it can be changed into a prime (16555166150561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248233326 + ... + 248300008.

It is an arithmetic number, because the mean of its divisors is an integer number (1129253529600).

Almost surely, 2^{16555166155561} is an apocalyptic number.

16555166155561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16555166155561 is a deficient number, since it is larger than the sum of its proper divisors (1512890318039).

16555166155561 is a wasteful number, since it uses less digits than its factorization.

16555166155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76196.

The product of its digits is 20250000, while the sum is 58.

The spelling of 16555166155561 in words is "sixteen trillion, five hundred fifty-five billion, one hundred sixty-six million, one hundred fifty-five thousand, five hundred sixty-one".