19864968776 has 16 divisors (see below), whose sum is σ = 38253487740. Its totient is φ = 9664038720.

The previous prime is 19864968769. The next prime is 19864968791. The reversal of 19864968776 is 67786946891.

It can be written as a sum of positive squares in 2 ways, for example, as 15264602500 + 4600366276 = 123550^2 + 67826^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33555395 + ... + 33555986.

Almost surely, 2^19864968776 is an apocalyptic number.

It is an amenable number.

19864968776 is a deficient number, since it is larger than the sum of its proper divisors (18388518964).

19864968776 is a wasteful number, since it uses less digits than its factorization.

19864968776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67111424 (or 67111420 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 71.

The spelling of 19864968776 in words is "nineteen billion, eight hundred sixty-four million, nine hundred sixty-eight thousand, seven hundred seventy-six".