198861153309 has 48 divisors (see below), whose sum is σ = 357503328000. Its totient is φ = 103715175168.

The previous prime is 198861153307. The next prime is 198861153319. The reversal of 198861153309 is 903351168891.

198861153309 is a `hidden beast` number, since 1 + 98 + 8 + 6 + 11 + 533 + 0 + 9 = 666.

It is not a de Polignac number, because 198861153309 - 2¹ = 198861153307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198861153307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1291209 + ... + 1436990.

It is an arithmetic number, because the mean of its divisors is an integer number (7447986000).

Almost surely, 2^198861153309 is an apocalyptic number.

It is an amenable number.

198861153309 is a deficient number, since it is larger than the sum of its proper divisors (158642174691).

198861153309 is a wasteful number, since it uses less digits than its factorization.

198861153309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728314 (or 2728311 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 198861153309 in words is "one hundred ninety-eight billion, eight hundred sixty-one million, one hundred fifty-three thousand, three hundred nine".