198961136639 has 2 divisors, whose sum is σ = 198961136640. Its totient is φ = 198961136638.

The previous prime is 198961136581. The next prime is 198961136711. The reversal of 198961136639 is 936631169891.

198961136639 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 198961136639 - 2¹⁶ = 198961071103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198961136939) 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, 99480568319 + 99480568320.

It is an arithmetic number, because the mean of its divisors is an integer number (99480568320).

Almost surely, 2^198961136639 is an apocalyptic number.

198961136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

198961136639 is an equidigital number, since it uses as much as digits as its factorization.

198961136639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11337408, while the sum is 62.

The spelling of 198961136639 in words is "one hundred ninety-eight billion, nine hundred sixty-one million, one hundred thirty-six thousand, six hundred thirty-nine".