19816964616 has 32 divisors (see below), whose sum is σ = 49549946400. Its totient is φ = 6604650240.

The previous prime is 19816964599. The next prime is 19816964621. The reversal of 19816964616 is 61646961891.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107755 + ... + 226373.

It is an arithmetic number, because the mean of its divisors is an integer number (1548435825).

Almost surely, 2^19816964616 is an apocalyptic number.

It is an amenable number.

19816964616 is an abundant number, since it is smaller than the sum of its proper divisors (29732981784).

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

19816964616 is a wasteful number, since it uses less digits than its factorization.

19816964616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125589 (or 125585 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The spelling of 19816964616 in words is "nineteen billion, eight hundred sixteen million, nine hundred sixty-four thousand, six hundred sixteen".