19963855155 has 16 divisors (see below), whose sum is σ = 31944350880. Its totient is φ = 10646661888.

The previous prime is 19963855151. The next prime is 19963855187. The reversal of 19963855155 is 55155836991.

It is not a de Polignac number, because 19963855155 - 2² = 19963855151 is a prime.

It is a super-3 number, since 3×19963855155³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19963855095 and 19963855104.

It is not an unprimeable number, because it can be changed into a prime (19963855151) 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, 238629 + ... + 311241.

It is an arithmetic number, because the mean of its divisors is an integer number (1996521930).

Almost surely, 2^19963855155 is an apocalyptic number.

19963855155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19963855155 is a deficient number, since it is larger than the sum of its proper divisors (11980495725).

19963855155 is a wasteful number, since it uses less digits than its factorization.

19963855155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90950.

The product of its digits is 7290000, while the sum is 57.

The spelling of 19963855155 in words is "nineteen billion, nine hundred sixty-three million, eight hundred fifty-five thousand, one hundred fifty-five".