19191197681973 has 12 divisors (see below), whose sum is σ = 27720657884608. Its totient is φ = 12794113783080.

The previous prime is 19191197681969. The next prime is 19191197681983. The reversal of 19191197681973 is 37918679119191.

It is a happy number.

19191197681973 is a `hidden beast` number, since 1 + 9 + 191 + 197 + 68 + 197 + 3 = 666.

It is not a de Polignac number, because 19191197681973 - 2² = 19191197681969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19191197681983) 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, 9478086 + ... + 11323272.

Almost surely, 2^{19191197681973} is an apocalyptic number.

It is an amenable number.

19191197681973 is a deficient number, since it is larger than the sum of its proper divisors (8529460202635).

19191197681973 is a wasteful number, since it uses less digits than its factorization.

19191197681973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000824 (or 3000821 counting only the distinct ones).

The product of its digits is 46294416, while the sum is 72.

The spelling of 19191197681973 in words is "nineteen trillion, one hundred ninety-one billion, one hundred ninety-seven million, six hundred eighty-one thousand, nine hundred seventy-three".