199678115955907 has 2 divisors, whose sum is σ = 199678115955908. Its totient is φ = 199678115955906.

The previous prime is 199678115955839. The next prime is 199678115955917. The reversal of 199678115955907 is 709559511876991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199678115955907 - 2⁷ = 199678115955779 is a prime.

It is not a weakly prime, because it can be changed into another prime (199678115955917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99839057977953 + 99839057977954.

It is an arithmetic number, because the mean of its divisors is an integer number (99839057977954).

Almost surely, 2^{199678115955907} is an apocalyptic number.

199678115955907 is a deficient number, since it is larger than the sum of its proper divisors (1).

199678115955907 is an equidigital number, since it uses as much as digits as its factorization.

199678115955907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1928934000, while the sum is 82.

The spelling of 199678115955907 in words is "one hundred ninety-nine trillion, six hundred seventy-eight billion, one hundred fifteen million, nine hundred fifty-five thousand, nine hundred seven".