19535816564356 has 9 divisors (see below), whose sum is σ = 34187694457399. Its totient is φ = 9767903862244.

The previous prime is 19535816564353. The next prime is 19535816564387. The reversal of 19535816564356 is 65346561853591.

The square root of 19535816564356 is 4419934.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19535816564291 and 19535816564300.

It is not an unprimeable number, because it can be changed into a prime (19535816564353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7734885 + ... + 9944851.

Almost surely, 2^{19535816564356} is an apocalyptic number.

19535816564356 is the 4419934-th square number.

It is an amenable number.

19535816564356 is a deficient number, since it is larger than the sum of its proper divisors (14651877893043).

19535816564356 is an frugal number, since it uses more digits than its factorization.

19535816564356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419938 (or 2209969 counting only the distinct ones).

The product of its digits is 349920000, while the sum is 67.

The spelling of 19535816564356 in words is "nineteen trillion, five hundred thirty-five billion, eight hundred sixteen million, five hundred sixty-four thousand, three hundred fifty-six".