6543173661 has 8 divisors (see below), whose sum is σ = 8724913440. Its totient is φ = 4361774832.

The previous prime is 6543173629. The next prime is 6543173669. The reversal of 6543173661 is 1663713456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6543173661 - 2⁵ = 6543173629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543173669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36471 + ... + 120068.

It is an arithmetic number, because the mean of its divisors is an integer number (1090614180).

Almost surely, 2^6543173661 is an apocalyptic number.

It is an amenable number.

6543173661 is a deficient number, since it is larger than the sum of its proper divisors (2181739779).

6543173661 is a wasteful number, since it uses less digits than its factorization.

6543173661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170475.

The product of its digits is 272160, while the sum is 42.

The square root of 6543173661 is about 80889.8860241501. The cubic root of 6543173661 is about 1870.3784168452.

The spelling of 6543173661 in words is "six billion, five hundred forty-three million, one hundred seventy-three thousand, six hundred sixty-one".