198180181801835 has 32 divisors (see below), whose sum is σ = 243094931557632. Its totient is φ = 155031112304640.

The previous prime is 198180181801817. The next prime is 198180181801883. The reversal of 198180181801835 is 538108181081891.

It is a happy number.

It is not a de Polignac number, because 198180181801835 - 2⁸ = 198180181801579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2615408009 + ... + 2615483781.

It is an arithmetic number, because the mean of its divisors is an integer number (7596716611176).

Almost surely, 2^{198180181801835} is an apocalyptic number.

198180181801835 is a deficient number, since it is larger than the sum of its proper divisors (44914749755797).

198180181801835 is a wasteful number, since it uses less digits than its factorization.

198180181801835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85703.

The product of its (nonzero) digits is 4423680, while the sum is 62.

The spelling of 198180181801835 in words is "one hundred ninety-eight trillion, one hundred eighty billion, one hundred eighty-one million, eight hundred one thousand, eight hundred thirty-five".