19997583555 has 16 divisors (see below), whose sum is σ = 31997886624. Its totient is φ = 10664793600.

The previous prime is 19997583553. The next prime is 19997583607. The reversal of 19997583555 is 55538579991.

It is not a de Polignac number, because 19997583555 - 2¹ = 19997583553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19997583553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518955 + ... + 556155.

It is an arithmetic number, because the mean of its divisors is an integer number (1999867914).

Almost surely, 2^19997583555 is an apocalyptic number.

19997583555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19997583555 is a deficient number, since it is larger than the sum of its proper divisors (12000303069).

19997583555 is a wasteful number, since it uses less digits than its factorization.

19997583555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73046.

The product of its digits is 76545000, while the sum is 66.

The spelling of 19997583555 in words is "nineteen billion, nine hundred ninety-seven million, five hundred eighty-three thousand, five hundred fifty-five".