6215665220 has 12 divisors (see below), whose sum is σ = 13052897004. Its totient is φ = 2486266080.

The previous prime is 6215665217. The next prime is 6215665237. The reversal of 6215665220 is 225665126.

It can be written as a sum of positive squares in 2 ways, for example, as 743216644 + 5472448576 = 27262^2 + 73976^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155391611 + ... + 155391650.

It is an arithmetic number, because the mean of its divisors is an integer number (1087741417).

Almost surely, 2^6215665220 is an apocalyptic number.

It is an amenable number.

6215665220 is an abundant number, since it is smaller than the sum of its proper divisors (6837231784).

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

6215665220 is a wasteful number, since it uses less digits than its factorization.

6215665220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310783270 (or 310783268 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 6215665220 is about 78839.4902317360. The cubic root of 6215665220 is about 1838.6364760322.

The spelling of 6215665220 in words is "six billion, two hundred fifteen million, six hundred sixty-five thousand, two hundred twenty".