19499968516 has 48 divisors (see below), whose sum is σ = 39374899200. Its totient is φ = 8277166080.

The previous prime is 19499968459. The next prime is 19499968517. The reversal of 19499968516 is 61586999491.

It is not an unprimeable number, because it can be changed into a prime (19499968517) 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, 1238260 + ... + 1253908.

It is an arithmetic number, because the mean of its divisors is an integer number (820310400).

Almost surely, 2^19499968516 is an apocalyptic number.

It is an amenable number.

19499968516 is an abundant number, since it is smaller than the sum of its proper divisors (19874930684).

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

19499968516 is a wasteful number, since it uses less digits than its factorization.

19499968516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16084 (or 16082 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 67.

The spelling of 19499968516 in words is "nineteen billion, four hundred ninety-nine million, nine hundred sixty-eight thousand, five hundred sixteen".