19139837945856 has 96 divisors (see below), whose sum is σ = 51745799851200. Its totient is φ = 6290087444480.

The previous prime is 19139837945849. The next prime is 19139837945923. The reversal of 19139837945856 is 65854973893191.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21501861 + ... + 22374308.

It is an arithmetic number, because the mean of its divisors is an integer number (539018748450).

Almost surely, 2^{19139837945856} is an apocalyptic number.

19139837945856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19139837945856 is an abundant number, since it is smaller than the sum of its proper divisors (32605961905344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19139837945856 is an equidigital number, since it uses as much as digits as its factorization.

19139837945856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43876265 (or 43876245 counting only the distinct ones).

The product of its digits is 1763596800, while the sum is 78.

The spelling of 19139837945856 in words is "nineteen trillion, one hundred thirty-nine billion, eight hundred thirty-seven million, nine hundred forty-five thousand, eight hundred fifty-six".