198966697 has 2 divisors, whose sum is σ = 198966698. Its totient is φ = 198966696.

The previous prime is 198966661. The next prime is 198966701. The reversal of 198966697 is 796669891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141039376 + 57927321 = 11876^2 + 7611^2 .

It is a cyclic number.

It is not a de Polignac number, because 198966697 - 2⁷ = 198966569 is a prime.

It is not a weakly prime, because it can be changed into another prime (198963697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99483348 + 99483349.

It is an arithmetic number, because the mean of its divisors is an integer number (99483349).

Almost surely, 2^198966697 is an apocalyptic number.

It is an amenable number.

198966697 is a deficient number, since it is larger than the sum of its proper divisors (1).

198966697 is an equidigital number, since it uses as much as digits as its factorization.

198966697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The square root of 198966697 is about 14105.5555367380. Note that the first 4 decimals coincide. The cubic root of 198966697 is about 583.7946760923.

It can be divided in two parts, 1989 and 66697, that added together give a palindrome (68686).

The spelling of 198966697 in words is "one hundred ninety-eight million, nine hundred sixty-six thousand, six hundred ninety-seven".