198660155699 has 2 divisors, whose sum is σ = 198660155700. Its totient is φ = 198660155698.

The previous prime is 198660155623. The next prime is 198660155719. The reversal of 198660155699 is 996551066891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198660155699 - 2¹² = 198660151603 is a prime.

It is not a weakly prime, because it can be changed into another prime (198660155299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99330077849 + 99330077850.

It is an arithmetic number, because the mean of its divisors is an integer number (99330077850).

Almost surely, 2^198660155699 is an apocalyptic number.

198660155699 is a deficient number, since it is larger than the sum of its proper divisors (1).

198660155699 is an equidigital number, since it uses as much as digits as its factorization.

198660155699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31492800, while the sum is 65.

The spelling of 198660155699 in words is "one hundred ninety-eight billion, six hundred sixty million, one hundred fifty-five thousand, six hundred ninety-nine".