19915912108 has 6 divisors (see below), whose sum is σ = 34852846196. Its totient is φ = 9957956052.

The previous prime is 19915912103. The next prime is 19915912111. The reversal of 19915912108 is 80121951991.

It is not an unprimeable number, because it can be changed into a prime (19915912103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489489010 + ... + 2489489017.

Almost surely, 2^19915912108 is an apocalyptic number.

It is an amenable number.

19915912108 is a deficient number, since it is larger than the sum of its proper divisors (14936934088).

19915912108 is a wasteful number, since it uses less digits than its factorization.

19915912108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978978031 (or 4978978029 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 46.

The spelling of 19915912108 in words is "nineteen billion, nine hundred fifteen million, nine hundred twelve thousand, one hundred eight".