198481070365561 has 3 divisors (see below), whose sum is σ = 198481084453893. Its totient is φ = 198481056277230.

The previous prime is 198481070365549. The next prime is 198481070365619. The reversal of 198481070365561 is 165563070184891.

The square root of 198481070365561 is 14088331.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 198481070365561 - 2⁴⁵ = 163296698276729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198481070365493 and 198481070365502.

It is not an unprimeable number, because it can be changed into a prime (198481070365531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7044166 + ... + 21132496.

It is an arithmetic number, because the mean of its divisors is an integer number (66160361484631).

Almost surely, 2^{198481070365561} is an apocalyptic number.

198481070365561 is the 14088331-st square number.

198481070365561 is the 7044166-th centered octagonal number.

It is an amenable number.

198481070365561 is a deficient number, since it is larger than the sum of its proper divisors (14088332).

198481070365561 is an frugal number, since it uses more digits than its factorization.

198481070365561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28176662 (or 14088331 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 64.

The spelling of 198481070365561 in words is "one hundred ninety-eight trillion, four hundred eighty-one billion, seventy million, three hundred sixty-five thousand, five hundred sixty-one".