6521004216 has 24 divisors (see below), whose sum is σ = 17661053280. Its totient is φ = 2173668048.

The previous prime is 6521004197. The next prime is 6521004241. The reversal of 6521004216 is 6124001256.

6521004216 is a `hidden beast` number, since 652 + 1 + 0 + 0 + 4 + 2 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6521004216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45284680 + ... + 45284823.

It is an arithmetic number, because the mean of its divisors is an integer number (735877220).

Almost surely, 2^6521004216 is an apocalyptic number.

It is an amenable number.

6521004216 is an abundant number, since it is smaller than the sum of its proper divisors (11140049064).

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

6521004216 is a wasteful number, since it uses less digits than its factorization.

6521004216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90569515 (or 90569508 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 6521004216 is about 80752.7350372729. The cubic root of 6521004216 is about 1868.2636341974.

The spelling of 6521004216 in words is "six billion, five hundred twenty-one million, four thousand, two hundred sixteen".