197770541797 has 4 divisors (see below), whose sum is σ = 197771614636. Its totient is φ = 197769468960.

The previous prime is 197770541783. The next prime is 197770541803. The reversal of 197770541797 is 797145077791.

197770541797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 444714²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 797145077791 = 197381 ⋅4038611.

It can be written as a sum of positive squares in 2 ways, for example, as 19374969636 + 178395572161 = 139194^2 + 422369^2 .

It is a cyclic number.

It is not a de Polignac number, because 197770541797 - 2¹¹ = 197770539749 is a prime.

It is a super-2 number, since 2×197770541797² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197770241797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181728 + ... + 654649.

It is an arithmetic number, because the mean of its divisors is an integer number (49442903659).

Almost surely, 2^197770541797 is an apocalyptic number.

It is an amenable number.

197770541797 is a deficient number, since it is larger than the sum of its proper divisors (1072839).

197770541797 is an equidigital number, since it uses as much as digits as its factorization.

197770541797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072838.

The product of its (nonzero) digits is 27227340, while the sum is 64.

The spelling of 197770541797 in words is "one hundred ninety-seven billion, seven hundred seventy million, five hundred forty-one thousand, seven hundred ninety-seven".