198540326917 has 4 divisors (see below), whose sum is σ = 198592536960. Its totient is φ = 198488116876.

The previous prime is 198540326909. The next prime is 198540326927. The reversal of 198540326917 is 719623045891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198540326917 - 2³ = 198540326909 is a prime.

It is a super-2 number, since 2×198540326917² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198540326927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26099317 + ... + 26106922.

It is an arithmetic number, because the mean of its divisors is an integer number (49648134240).

It is a 1-persistent number, because it is pandigital, but 2⋅198540326917 = 397080653834 is not.

Almost surely, 2^198540326917 is an apocalyptic number.

It is an amenable number.

198540326917 is a deficient number, since it is larger than the sum of its proper divisors (52210043).

198540326917 is an equidigital number, since it uses as much as digits as its factorization.

198540326917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52210042.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 198540326917 in words is "one hundred ninety-eight billion, five hundred forty million, three hundred twenty-six thousand, nine hundred seventeen".