206191796709887 has 4 divisors (see below), whose sum is σ = 206197808692656. Its totient is φ = 206185784727120.

The previous prime is 206191796709883. The next prime is 206191796709931. The reversal of 206191796709887 is 788907697191602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206191796709887 - 2² = 206191796709883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206191796709883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3005939939 + ... + 3006008532.

It is an arithmetic number, because the mean of its divisors is an integer number (51549452173164).

Almost surely, 2^{206191796709887} is an apocalyptic number.

206191796709887 is a deficient number, since it is larger than the sum of its proper divisors (6011982769).

206191796709887 is an equidigital number, since it uses as much as digits as its factorization.

206191796709887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011982768.

The product of its (nonzero) digits is 1152216576, while the sum is 80.

The spelling of 206191796709887 in words is "two hundred six trillion, one hundred ninety-one billion, seven hundred ninety-six million, seven hundred nine thousand, eight hundred eighty-seven".