19994697516 has 12 divisors (see below), whose sum is σ = 46654294232. Its totient is φ = 6664899168.

The previous prime is 19994697497. The next prime is 19994697551. The reversal of 19994697516 is 61579649991.

It is a tau number, because it is divible by the number of its divisors (12).

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, 833112385 + ... + 833112408.

Almost surely, 2^19994697516 is an apocalyptic number.

It is an amenable number.

19994697516 is an abundant number, since it is smaller than the sum of its proper divisors (26659596716).

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

19994697516 is a wasteful number, since it uses less digits than its factorization.

19994697516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666224800 (or 1666224798 counting only the distinct ones).

The product of its digits is 33067440, while the sum is 66.

The spelling of 19994697516 in words is "nineteen billion, nine hundred ninety-four million, six hundred ninety-seven thousand, five hundred sixteen".