198537253779 has 16 divisors (see below), whose sum is σ = 284235609600. Its totient is φ = 122817851520.

The previous prime is 198537253723. The next prime is 198537253781. The reversal of 198537253779 is 977352735891.

It is a happy number.

It is not a de Polignac number, because 198537253779 - 2¹⁵ = 198537221011 is a prime.

It is a super-2 number, since 2×198537253779² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198537253379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27411079 + ... + 27418320.

It is an arithmetic number, because the mean of its divisors is an integer number (17764725600).

Almost surely, 2^198537253779 is an apocalyptic number.

198537253779 is a deficient number, since it is larger than the sum of its proper divisors (85698355821).

198537253779 is a wasteful number, since it uses less digits than its factorization.

198537253779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54829490.

The product of its digits is 100018800, while the sum is 66.

The spelling of 198537253779 in words is "one hundred ninety-eight billion, five hundred thirty-seven million, two hundred fifty-three thousand, seven hundred seventy-nine".