16198561197 has 160 divisors (see below), whose sum is σ = 31719485952. Its totient is φ = 7994474496.

The previous prime is 16198561189. The next prime is 16198561199. The reversal of 16198561197 is 79116589161.

It is a happy number.

16198561197 is a `hidden beast` number, since 1 + 6 + 19 + 8 + 5 + 611 + 9 + 7 = 666.

It is not a de Polignac number, because 16198561197 - 2³ = 16198561189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16198561199) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 32203648 + ... + 32204150.

Almost surely, 2^16198561197 is an apocalyptic number.

16198561197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16198561197 is a deficient number, since it is larger than the sum of its proper divisors (15520924755).

16198561197 is a wasteful number, since it uses less digits than its factorization.

16198561197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 800 counting only the distinct ones).

The product of its digits is 816480, while the sum is 54.

The spelling of 16198561197 in words is "sixteen billion, one hundred ninety-eight million, five hundred sixty-one thousand, one hundred ninety-seven".