198941986213 has 6 divisors (see below), whose sum is σ = 200214757106. Its totient is φ = 197669286672.

The previous prime is 198941986153. The next prime is 198941986267. The reversal of 198941986213 is 312689149891.

It can be written as a sum of positive squares in 3 ways, for example, as 5076135009 + 193865851204 = 71247^2 + 440302^2 .

It is a de Polignac number, because none of the positive numbers 2^k-198941986213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198941986913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5570931 + ... + 5606527.

Almost surely, 2^198941986213 is an apocalyptic number.

It is an amenable number.

198941986213 is a deficient number, since it is larger than the sum of its proper divisors (1272770893).

198941986213 is an frugal number, since it uses more digits than its factorization.

198941986213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71351 (or 35754 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 61.

The spelling of 198941986213 in words is "one hundred ninety-eight billion, nine hundred forty-one million, nine hundred eighty-six thousand, two hundred thirteen".