197218757689 has 4 divisors (see below), whose sum is σ = 197768113920. Its totient is φ = 196669401460.

The previous prime is 197218757683. The next prime is 197218757711. The reversal of 197218757689 is 986757812791.

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: 986757812791 = 17 ⋅58044577223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197218757689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197218757683) 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, 274677577 + ... + 274678294.

It is an arithmetic number, because the mean of its divisors is an integer number (49442028480).

Almost surely, 2^197218757689 is an apocalyptic number.

It is an amenable number.

197218757689 is a deficient number, since it is larger than the sum of its proper divisors (549356231).

197218757689 is an equidigital number, since it uses as much as digits as its factorization.

197218757689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549356230.

The product of its digits is 106686720, while the sum is 70.

The spelling of 197218757689 in words is "one hundred ninety-seven billion, two hundred eighteen million, seven hundred fifty-seven thousand, six hundred eighty-nine".