6645520616 has 32 divisors (see below), whose sum is σ = 14251586880. Its totient is φ = 2845843200.

The previous prime is 6645520543. The next prime is 6645520627. The reversal of 6645520616 is 6160255466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26336 + ... + 118256.

It is an arithmetic number, because the mean of its divisors is an integer number (445362090).

Almost surely, 2^6645520616 is an apocalyptic number.

It is an amenable number.

6645520616 is an abundant number, since it is smaller than the sum of its proper divisors (7606066264).

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

6645520616 is a wasteful number, since it uses less digits than its factorization.

6645520616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93225 (or 93221 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 6645520616 is about 81520.0626594460. The cubic root of 6645520616 is about 1880.0800305451.

The spelling of 6645520616 in words is "six billion, six hundred forty-five million, five hundred twenty thousand, six hundred sixteen".