19697978047 has 12 divisors (see below), whose sum is σ = 22925116368. Its totient is φ = 16853883200.

The previous prime is 19697978029. The next prime is 19697978063. The reversal of 19697978047 is 74087979691.

It is a de Polignac number, because none of the positive numbers 2^k-19697978047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19697978947) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4785979 + ... + 4790092.

It is an arithmetic number, because the mean of its divisors is an integer number (1910426364).

Almost surely, 2^19697978047 is an apocalyptic number.

19697978047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

19697978047 is a deficient number, since it is larger than the sum of its proper divisors (3227138321).

19697978047 is a wasteful number, since it uses less digits than its factorization.

19697978047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9576110 (or 9576099 counting only the distinct ones).

The product of its (nonzero) digits is 48009024, while the sum is 67.

The spelling of 19697978047 in words is "nineteen billion, six hundred ninety-seven million, nine hundred seventy-eight thousand, forty-seven".