198694497579 has 16 divisors (see below), whose sum is σ = 265678828800. Its totient is φ = 132086697696.

The previous prime is 198694497541. The next prime is 198694497601. The reversal of 198694497579 is 975794496891.

It is not a de Polignac number, because 198694497579 - 2¹⁶ = 198694432043 is a prime.

It is a super-2 number, since 2×198694497579² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198694497779) 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, 10328832 + ... + 10348050.

It is an arithmetic number, because the mean of its divisors is an integer number (16604926800).

Almost surely, 2^198694497579 is an apocalyptic number.

198694497579 is a deficient number, since it is larger than the sum of its proper divisors (66984331221).

198694497579 is a wasteful number, since it uses less digits than its factorization.

198694497579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28834.

The product of its digits is 1234517760, while the sum is 78.

The spelling of 198694497579 in words is "one hundred ninety-eight billion, six hundred ninety-four million, four hundred ninety-seven thousand, five hundred seventy-nine".