6543220356 has 36 divisors (see below), whose sum is σ = 16553290572. Its totient is φ = 2179295424.

The previous prime is 6543220351. The next prime is 6543220363. The reversal of 6543220356 is 6530223456.

It can be written as a sum of positive squares in 2 ways, for example, as 4307821956 + 2235398400 = 65634^2 + 47280^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6543220356.

It is not an unprimeable number, because it can be changed into a prime (6543220351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28935 + ... + 117998.

It is an arithmetic number, because the mean of its divisors is an integer number (459813627).

Almost surely, 2^6543220356 is an apocalyptic number.

It is an amenable number.

6543220356 is an abundant number, since it is smaller than the sum of its proper divisors (10010070216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6543220356 is a wasteful number, since it uses less digits than its factorization.

6543220356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148180 (or 148175 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 6543220356 is about 80890.1746567530. The cubic root of 6543220356 is about 1870.3828661189.

The spelling of 6543220356 in words is "six billion, five hundred forty-three million, two hundred twenty thousand, three hundred fifty-six".