19666135696 has 15 divisors (see below), whose sum is σ = 38104224771. Its totient is φ = 9832787376.

The previous prime is 19666135679. The next prime is 19666135703. The reversal of 19666135696 is 69653166691.

The square root of 19666135696 is 140236.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19666135696.

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 2 ways as a sum of consecutive naturals, for example, 543415 + ... + 578473.

Almost surely, 2^19666135696 is an apocalyptic number.

19666135696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19666135696 is the 140236-th square number.

It is an amenable number.

19666135696 is a deficient number, since it is larger than the sum of its proper divisors (18438089075).

19666135696 is an frugal number, since it uses more digits than its factorization.

19666135696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70126 (or 35061 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 58.

The spelling of 19666135696 in words is "nineteen billion, six hundred sixty-six million, one hundred thirty-five thousand, six hundred ninety-six".