19660778036 has 12 divisors (see below), whose sum is σ = 34427012928. Its totient is φ = 9824488632.

The previous prime is 19660777973. The next prime is 19660778087. The reversal of 19660778036 is 63087706691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1467596 + ... + 1480931.

It is an arithmetic number, because the mean of its divisors is an integer number (2868917744).

Almost surely, 2^19660778036 is an apocalyptic number.

It is an amenable number.

19660778036 is a deficient number, since it is larger than the sum of its proper divisors (14766234892).

19660778036 is a wasteful number, since it uses less digits than its factorization.

19660778036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950198 (or 2950196 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 19660778036 in words is "nineteen billion, six hundred sixty million, seven hundred seventy-eight thousand, thirty-six".