198688544461 has 4 divisors (see below), whose sum is σ = 216751139424. Its totient is φ = 180625949500.

The previous prime is 198688544443. The next prime is 198688544477. The reversal of 198688544461 is 164445886891.

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 198688544461 - 2¹⁷ = 198688413389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198688544393 and 198688544402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198688544261) 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, 9031297465 + ... + 9031297486.

It is an arithmetic number, because the mean of its divisors is an integer number (54187784856).

Almost surely, 2^198688544461 is an apocalyptic number.

198688544461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198688544461 is a deficient number, since it is larger than the sum of its proper divisors (18062594963).

198688544461 is a wasteful number, since it uses less digits than its factorization.

198688544461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18062594962.

The product of its digits is 53084160, while the sum is 64.

The spelling of 198688544461 in words is "one hundred ninety-eight billion, six hundred eighty-eight million, five hundred forty-four thousand, four hundred sixty-one".