6543447901 has 4 divisors (see below), whose sum is σ = 6695621152. Its totient is φ = 6391274652.

The previous prime is 6543447881. The next prime is 6543447907. The reversal of 6543447901 is 1097443456.

6543447901 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6543447901 - 2¹⁹ = 6542923613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 152173207 = 6543447901 / (6 + 5 + 4 + 3 + 4 + 4 + 7 + 9 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543447907) 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, 76086561 + ... + 76086646.

It is an arithmetic number, because the mean of its divisors is an integer number (1673905288).

Almost surely, 2^6543447901 is an apocalyptic number.

It is an amenable number.

6543447901 is a deficient number, since it is larger than the sum of its proper divisors (152173251).

6543447901 is a wasteful number, since it uses less digits than its factorization.

6543447901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152173250.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 6543447901 is about 80891.5811503274. The cubic root of 6543447901 is about 1870.4045471523.

The spelling of 6543447901 in words is "six billion, five hundred forty-three million, four hundred forty-seven thousand, nine hundred one".