197698764997 has 4 divisors (see below), whose sum is σ = 204515963820. Its totient is φ = 190881566176.

The previous prime is 197698764979. The next prime is 197698765007. The reversal of 197698764997 is 799467896791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50391719361 + 147307045636 = 224481^2 + 383806^2 .

It is a cyclic number.

It is not a de Polignac number, because 197698764997 - 2³¹ = 195551281349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197698764997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197698767997) 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 3 ways as a sum of consecutive naturals, for example, 3408599368 + ... + 3408599425.

It is an arithmetic number, because the mean of its divisors is an integer number (51128990955).

Almost surely, 2^197698764997 is an apocalyptic number.

It is an amenable number.

197698764997 is a deficient number, since it is larger than the sum of its proper divisors (6817198823).

197698764997 is an equidigital number, since it uses as much as digits as its factorization.

197698764997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817198822.

The product of its digits is 2592487296, while the sum is 82.

The spelling of 197698764997 in words is "one hundred ninety-seven billion, six hundred ninety-eight million, seven hundred sixty-four thousand, nine hundred ninety-seven".