198861371711 has 2 divisors, whose sum is σ = 198861371712. Its totient is φ = 198861371710.

The previous prime is 198861371671. The next prime is 198861371783. The reversal of 198861371711 is 117173168891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198861371711 - 2⁶ = 198861371647 is a prime.

It is a super-2 number, since 2×198861371711² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198861371911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99430685855 + 99430685856.

It is an arithmetic number, because the mean of its divisors is an integer number (99430685856).

Almost surely, 2^198861371711 is an apocalyptic number.

198861371711 is a deficient number, since it is larger than the sum of its proper divisors (1).

198861371711 is an equidigital number, since it uses as much as digits as its factorization.

198861371711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 53.

The spelling of 198861371711 in words is "one hundred ninety-eight billion, eight hundred sixty-one million, three hundred seventy-one thousand, seven hundred eleven".