196658806491791 has 32 divisors (see below), whose sum is σ = 225918222286848. Its totient is φ = 167691817123200.

The previous prime is 196658806491743. The next prime is 196658806491821. The reversal of 196658806491791 is 197194608856691.

196658806491791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 196658806491791 - 2¹⁸ = 196658806229647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196658806491991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19091229341 + ... + 19091239641.

It is an arithmetic number, because the mean of its divisors is an integer number (7059944446464).

Almost surely, 2^{196658806491791} is an apocalyptic number.

196658806491791 is a deficient number, since it is larger than the sum of its proper divisors (29259415795057).

196658806491791 is a wasteful number, since it uses less digits than its factorization.

196658806491791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17871.

The product of its (nonzero) digits is 1410877440, while the sum is 80.

The spelling of 196658806491791 in words is "one hundred ninety-six trillion, six hundred fifty-eight billion, eight hundred six million, four hundred ninety-one thousand, seven hundred ninety-one".