196562178891 has 12 divisors (see below), whose sum is σ = 305763389568. Its totient is φ = 120961340784.

The previous prime is 196562178829. The next prime is 196562178899. The reversal of 196562178891 is 198871265691.

It is not a de Polignac number, because 196562178891 - 2⁷ = 196562178763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196562178899) 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 11 ways as a sum of consecutive naturals, for example, 840009195 + ... + 840009428.

It is an arithmetic number, because the mean of its divisors is an integer number (25480282464).

Almost surely, 2^196562178891 is an apocalyptic number.

196562178891 is a deficient number, since it is larger than the sum of its proper divisors (109201210677).

196562178891 is a wasteful number, since it uses less digits than its factorization.

196562178891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680018642 (or 1680018639 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 196562178891 in words is "one hundred ninety-six billion, five hundred sixty-two million, one hundred seventy-eight thousand, eight hundred ninety-one".