197668677939 has 4 divisors (see below), whose sum is σ = 263558237256. Its totient is φ = 131779118624.

The previous prime is 197668677911. The next prime is 197668677949. The reversal of 197668677939 is 939776866791.

197668677939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 197668677939 - 2²⁰ = 197667629363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197668677949) 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, 32944779654 + ... + 32944779659.

It is an arithmetic number, because the mean of its divisors is an integer number (65889559314).

Almost surely, 2^197668677939 is an apocalyptic number.

197668677939 is a deficient number, since it is larger than the sum of its proper divisors (65889559317).

197668677939 is an equidigital number, since it uses as much as digits as its factorization.

197668677939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65889559316.

The product of its digits is 1296243648, while the sum is 78.

The spelling of 197668677939 in words is "one hundred ninety-seven billion, six hundred sixty-eight million, six hundred seventy-seven thousand, nine hundred thirty-nine".