198379985244977 has 2 divisors, whose sum is σ = 198379985244978. Its totient is φ = 198379985244976.

The previous prime is 198379985244949. The next prime is 198379985245063. The reversal of 198379985244977 is 779442589973891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198347901628816 + 32083616161 = 14083604^2 + 179119^2 .

It is a cyclic number.

It is not a de Polignac number, because 198379985244977 - 2⁶ = 198379985244913 is a prime.

It is not a weakly prime, because it can be changed into another prime (198379985244577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99189992622488 + 99189992622489.

It is an arithmetic number, because the mean of its divisors is an integer number (99189992622489).

Almost surely, 2^{198379985244977} is an apocalyptic number.

It is an amenable number.

198379985244977 is a deficient number, since it is larger than the sum of its proper divisors (1).

198379985244977 is an equidigital number, since it uses as much as digits as its factorization.

198379985244977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69132994560, while the sum is 92.

The spelling of 198379985244977 in words is "one hundred ninety-eight trillion, three hundred seventy-nine billion, nine hundred eighty-five million, two hundred forty-four thousand, nine hundred seventy-seven".