198497585794891 has 32 divisors (see below), whose sum is σ = 204489969223680. Its totient is φ = 192585826720896.

The previous prime is 198497585794861. The next prime is 198497585794931.

198497585794891 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 198497585794891 - 2¹⁹ = 198497585270603 is a prime.

It is a super-2 number, since 2×198497585794891² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198497585794891.

It is not an unprimeable number, because it can be changed into a prime (198497585794801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5485310500 + ... + 5485346686.

It is an arithmetic number, because the mean of its divisors is an integer number (6390311538240).

Almost surely, 2^{198497585794891} is an apocalyptic number.

198497585794891 is a deficient number, since it is larger than the sum of its proper divisors (5992383428789).

198497585794891 is a wasteful number, since it uses less digits than its factorization.

198497585794891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38283.

The product of its digits is 65840947200, while the sum is 94.

The spelling of 198497585794891 in words is "one hundred ninety-eight trillion, four hundred ninety-seven billion, five hundred eighty-five million, seven hundred ninety-four thousand, eight hundred ninety-one".