197916443987 has 2 divisors, whose sum is σ = 197916443988. Its totient is φ = 197916443986.

The previous prime is 197916443983. The next prime is 197916444013. The reversal of 197916443987 is 789344619791.

197916443987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197916443987 - 2² = 197916443983 is a prime.

It is not a weakly prime, because it can be changed into another prime (197916443983) 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 as a sum of consecutive naturals, namely, 98958221993 + 98958221994.

It is an arithmetic number, because the mean of its divisors is an integer number (98958221994).

Almost surely, 2^197916443987 is an apocalyptic number.

197916443987 is a deficient number, since it is larger than the sum of its proper divisors (1).

197916443987 is an equidigital number, since it uses as much as digits as its factorization.

197916443987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 68.

The spelling of 197916443987 in words is "one hundred ninety-seven billion, nine hundred sixteen million, four hundred forty-three thousand, nine hundred eighty-seven".