197074385609 has 4 divisors (see below), whose sum is σ = 199106080404. Its totient is φ = 195042690816.

The previous prime is 197074385591. The next prime is 197074385611. The reversal of 197074385609 is 906583470791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906583470791 = 1193 ⋅759919087.

It can be written as a sum of positive squares in 2 ways, for example, as 132680248009 + 64394137600 = 364253^2 + 253760^2 .

It is a cyclic number.

It is not a de Polignac number, because 197074385609 - 2¹⁶ = 197074320073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197074385699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015847252 + ... + 1015847445.

It is an arithmetic number, because the mean of its divisors is an integer number (49776520101).

Almost surely, 2^197074385609 is an apocalyptic number.

It is an amenable number.

197074385609 is a deficient number, since it is larger than the sum of its proper divisors (2031694795).

197074385609 is an equidigital number, since it uses as much as digits as its factorization.

197074385609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031694794.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 197074385609 in words is "one hundred ninety-seven billion, seventy-four million, three hundred eighty-five thousand, six hundred nine".