16555220321351 has 4 divisors (see below), whose sum is σ = 16555265687400. Its totient is φ = 16555174955304.

The previous prime is 16555220321303. The next prime is 16555220321357. The reversal of 16555220321351 is 15312302255561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16555220321351 - 2¹⁴ = 16555220304967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16555220321299 and 16555220321308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555220321357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22131161 + ... + 22866978.

It is an arithmetic number, because the mean of its divisors is an integer number (4138816421850).

Almost surely, 2^{16555220321351} is an apocalyptic number.

16555220321351 is a deficient number, since it is larger than the sum of its proper divisors (45366049).

16555220321351 is an equidigital number, since it uses as much as digits as its factorization.

16555220321351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45366048.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 16555220321351 in words is "sixteen trillion, five hundred fifty-five billion, two hundred twenty million, three hundred twenty-one thousand, three hundred fifty-one".