197201026805 has 4 divisors (see below), whose sum is σ = 236641232172. Its totient is φ = 157760821440.

The previous prime is 197201026793. The next prime is 197201026849. The reversal of 197201026805 is 508620102791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508620102791 = 4721 ⋅107735671.

It can be written as a sum of positive squares in 2 ways, for example, as 81737666404 + 115463360401 = 285898^2 + 339799^2 .

It is not a de Polignac number, because 197201026805 - 2⁶ = 197201026741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19720102676 + ... + 19720102685.

It is an arithmetic number, because the mean of its divisors is an integer number (59160308043).

Almost surely, 2^197201026805 is an apocalyptic number.

It is an amenable number.

197201026805 is a deficient number, since it is larger than the sum of its proper divisors (39440205367).

197201026805 is an equidigital number, since it uses as much as digits as its factorization.

197201026805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39440205366.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 197201026805 in words is "one hundred ninety-seven billion, two hundred one million, twenty-six thousand, eight hundred five".