19828855804897 has 4 divisors (see below), whose sum is σ = 20995259087556. Its totient is φ = 18662452522240.

The previous prime is 19828855804777. The next prime is 19828855804907. The reversal of 19828855804897 is 79840855882891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7620603175936 + 12208252628961 = 2760544^2 + 3494031^2 .

It is a cyclic number.

It is not a de Polignac number, because 19828855804897 - 2¹¹ = 19828855802849 is a prime.

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 19828855804897.

It is not an unprimeable number, because it can be changed into a prime (19828855804297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583201641304 + ... + 583201641337.

It is an arithmetic number, because the mean of its divisors is an integer number (5248814771889).

Almost surely, 2^{19828855804897} is an apocalyptic number.

19828855804897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19828855804897 is a deficient number, since it is larger than the sum of its proper divisors (1166403282659).

19828855804897 is a wasteful number, since it uses less digits than its factorization.

19828855804897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166403282658.

The product of its (nonzero) digits is 3715891200, while the sum is 82.

The spelling of 19828855804897 in words is "nineteen trillion, eight hundred twenty-eight billion, eight hundred fifty-five million, eight hundred four thousand, eight hundred ninety-seven".