19916820255 has 16 divisors (see below), whose sum is σ = 31953752064. Its totient is φ = 10593357600.

The previous prime is 19916820241. The next prime is 19916820277. The reversal of 19916820255 is 55202861991.

It is not a de Polignac number, because 19916820255 - 2⁹ = 19916819743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803471 + ... + 1814480.

It is an arithmetic number, because the mean of its divisors is an integer number (1997109504).

Almost surely, 2^19916820255 is an apocalyptic number.

19916820255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19916820255 is a deficient number, since it is larger than the sum of its proper divisors (12036931809).

19916820255 is a wasteful number, since it uses less digits than its factorization.

19916820255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618326.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 19916820255 in words is "nineteen billion, nine hundred sixteen million, eight hundred twenty thousand, two hundred fifty-five".