19915217116 has 6 divisors (see below), whose sum is σ = 34851629960. Its totient is φ = 9957608556.

The previous prime is 19915217111. The next prime is 19915217167. The reversal of 19915217116 is 61171251991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19915217111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489402136 + ... + 2489402143.

Almost surely, 2^19915217116 is an apocalyptic number.

It is an amenable number.

19915217116 is a deficient number, since it is larger than the sum of its proper divisors (14936412844).

19915217116 is a wasteful number, since it uses less digits than its factorization.

19915217116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978804283 (or 4978804281 counting only the distinct ones).

The product of its digits is 34020, while the sum is 43.

The spelling of 19915217116 in words is "nineteen billion, nine hundred fifteen million, two hundred seventeen thousand, one hundred sixteen".