16405334220655 has 4 divisors (see below), whose sum is σ = 19686401064792. Its totient is φ = 13124267376520.

The previous prime is 16405334220637. The next prime is 16405334220689. The reversal of 16405334220655 is 55602243350461.

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

It is not a de Polignac number, because 16405334220655 - 2⁴¹ = 14206310965103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640533422061 + ... + 1640533422070.

It is an arithmetic number, because the mean of its divisors is an integer number (4921600266198).

Almost surely, 2^{16405334220655} is an apocalyptic number.

16405334220655 is a deficient number, since it is larger than the sum of its proper divisors (3281066844137).

16405334220655 is an equidigital number, since it uses as much as digits as its factorization.

16405334220655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281066844136.

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 16405334220655 in words is "sixteen trillion, four hundred five billion, three hundred thirty-four million, two hundred twenty thousand, six hundred fifty-five".