19638191112 has 16 divisors (see below), whose sum is σ = 49095477840. Its totient is φ = 6546063696.

The previous prime is 19638190991. The next prime is 19638191143. The reversal of 19638191112 is 21119183691.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409128958 + ... + 409129005.

It is an arithmetic number, because the mean of its divisors is an integer number (3068467365).

Almost surely, 2^19638191112 is an apocalyptic number.

19638191112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19638191112 is an abundant number, since it is smaller than the sum of its proper divisors (29457286728).

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

19638191112 is a wasteful number, since it uses less digits than its factorization.

19638191112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818257972 (or 818257968 counting only the distinct ones).

The product of its digits is 23328, while the sum is 42.

The spelling of 19638191112 in words is "nineteen billion, six hundred thirty-eight million, one hundred ninety-one thousand, one hundred twelve".