19784195478449 has 8 divisors (see below), whose sum is σ = 19981571353128. Its totient is φ = 19586848873600.

The previous prime is 19784195478431. The next prime is 19784195478479. The reversal of 19784195478449 is 94487459148791.

It can be written as a sum of positive squares in 4 ways, for example, as 2460553018225 + 17323642460224 = 1568615^2 + 4162168^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19784195478449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19784195478479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5957612 + ... + 8663805.

It is an arithmetic number, because the mean of its divisors is an integer number (2497696419141).

Almost surely, 2^{19784195478449} is an apocalyptic number.

It is an amenable number.

19784195478449 is a deficient number, since it is larger than the sum of its proper divisors (197375874679).

19784195478449 is a wasteful number, since it uses less digits than its factorization.

19784195478449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14634915.

The product of its digits is 2926264320, while the sum is 80.

The spelling of 19784195478449 in words is "nineteen trillion, seven hundred eighty-four billion, one hundred ninety-five million, four hundred seventy-eight thousand, four hundred forty-nine".