198388446001861 has 4 divisors (see below), whose sum is σ = 198389411775072. Its totient is φ = 198387480228652.

The previous prime is 198388446001853. The next prime is 198388446002011. The reversal of 198388446001861 is 168100644883891.

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 198388446001861 - 2³ = 198388446001853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198388446002861) 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, 482578411 + ... + 482989336.

It is an arithmetic number, because the mean of its divisors is an integer number (49597352943768).

Almost surely, 2^{198388446001861} is an apocalyptic number.

It is an amenable number.

198388446001861 is a deficient number, since it is larger than the sum of its proper divisors (965773211).

198388446001861 is an equidigital number, since it uses as much as digits as its factorization.

198388446001861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965773210.

The product of its (nonzero) digits is 63700992, while the sum is 67.

The spelling of 198388446001861 in words is "one hundred ninety-eight trillion, three hundred eighty-eight billion, four hundred forty-six million, one thousand, eight hundred sixty-one".