196491166509 has 16 divisors (see below), whose sum is σ = 286518083904. Its totient is φ = 118788576000.

The previous prime is 196491166471. The next prime is 196491166523. The reversal of 196491166509 is 905661194691.

It is not a de Polignac number, because 196491166509 - 2¹⁷ = 196491035437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196491166579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7411054 + ... + 7437519.

It is an arithmetic number, because the mean of its divisors is an integer number (17907380244).

Almost surely, 2^196491166509 is an apocalyptic number.

It is an amenable number.

196491166509 is a deficient number, since it is larger than the sum of its proper divisors (90026917395).

196491166509 is a wasteful number, since it uses less digits than its factorization.

196491166509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14848988.

The product of its (nonzero) digits is 3149280, while the sum is 57.

The spelling of 196491166509 in words is "one hundred ninety-six billion, four hundred ninety-one million, one hundred sixty-six thousand, five hundred nine".