196817718691 has 24 divisors (see below), whose sum is σ = 225692616240. Its totient is φ = 170199374400.

The previous prime is 196817718667. The next prime is 196817718701.

It is a happy number.

196817718691 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 196817718691 - 2⁵ = 196817718659 is a prime.

It is a super-2 number, since 2×196817718691² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196817715691) 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 23 ways as a sum of consecutive naturals, for example, 959805 + ... + 1146673.

It is an arithmetic number, because the mean of its divisors is an integer number (9403859010).

Almost surely, 2^196817718691 is an apocalyptic number.

196817718691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

196817718691 is a deficient number, since it is larger than the sum of its proper divisors (28874897549).

196817718691 is a wasteful number, since it uses less digits than its factorization.

196817718691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187107 (or 187084 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 64.

The spelling of 196817718691 in words is "one hundred ninety-six billion, eight hundred seventeen million, seven hundred eighteen thousand, six hundred ninety-one".