197387644269 has 4 divisors (see below), whose sum is σ = 263183525696. Its totient is φ = 131591762844.

The previous prime is 197387644241. The next prime is 197387644303. The reversal of 197387644269 is 962446783791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 962446783791 = 3 ⋅320815594597.

It is not a de Polignac number, because 197387644269 - 2³⁶ = 128668167533 is a prime.

It is a super-2 number, since 2×197387644269² (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 (197387644669) by changing a digit.

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, 32897940709 + ... + 32897940714.

It is an arithmetic number, because the mean of its divisors is an integer number (65795881424).

Almost surely, 2^197387644269 is an apocalyptic number.

It is an amenable number.

197387644269 is a deficient number, since it is larger than the sum of its proper divisors (65795881427).

197387644269 is an equidigital number, since it uses as much as digits as its factorization.

197387644269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65795881426.

The product of its digits is 109734912, while the sum is 66.

The spelling of 197387644269 in words is "one hundred ninety-seven billion, three hundred eighty-seven million, six hundred forty-four thousand, two hundred sixty-nine".