198679895537 has 2 divisors, whose sum is σ = 198679895538. Its totient is φ = 198679895536.

The previous prime is 198679895527. The next prime is 198679895569. The reversal of 198679895537 is 735598976891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195208446976 + 3471448561 = 441824^2 + 58919^2 .

It is an emirp because it is prime and its reverse (735598976891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198679895537 - 2³⁴ = 181500026353 is a prime.

It is not a weakly prime, because it can be changed into another prime (198679895527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99339947768 + 99339947769.

It is an arithmetic number, because the mean of its divisors is an integer number (99339947769).

Almost surely, 2^198679895537 is an apocalyptic number.

It is an amenable number.

198679895537 is a deficient number, since it is larger than the sum of its proper divisors (1).

198679895537 is an equidigital number, since it uses as much as digits as its factorization.

198679895537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1028764800, while the sum is 77.

The spelling of 198679895537 in words is "one hundred ninety-eight billion, six hundred seventy-nine million, eight hundred ninety-five thousand, five hundred thirty-seven".