197668677949 has 2 divisors, whose sum is σ = 197668677950. Its totient is φ = 197668677948.

The previous prime is 197668677911. The next prime is 197668677959. The reversal of 197668677949 is 949776866791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143678902500 + 53989775449 = 379050^2 + 232357^2 .

It is a cyclic number.

It is not a de Polignac number, because 197668677949 - 2¹¹ = 197668675901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197668677959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98834338974 + 98834338975.

It is an arithmetic number, because the mean of its divisors is an integer number (98834338975).

Almost surely, 2^197668677949 is an apocalyptic number.

It is an amenable number.

197668677949 is a deficient number, since it is larger than the sum of its proper divisors (1).

197668677949 is an equidigital number, since it uses as much as digits as its factorization.

197668677949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728324864, while the sum is 79.

The spelling of 197668677949 in words is "one hundred ninety-seven billion, six hundred sixty-eight million, six hundred seventy-seven thousand, nine hundred forty-nine".