6551521000 has 64 divisors (see below), whose sum is σ = 15479642880. Its totient is φ = 2595124800.

The previous prime is 6551520991. The next prime is 6551521003. The reversal of 6551521000 is 1251556.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (6551521003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71197 + ... + 134803.

It is an arithmetic number, because the mean of its divisors is an integer number (241869420).

Almost surely, 2^6551521000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6551521000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7739821440).

6551521000 is an abundant number, since it is smaller than the sum of its proper divisors (8928121880).

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

6551521000 is a wasteful number, since it uses less digits than its factorization.

6551521000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63731 (or 63717 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 6551521000 is about 80941.4665051233. The cubic root of 6551521000 is about 1871.1734463427.

Adding to 6551521000 its reverse (1251556), we get a palindrome (6552772556).

The spelling of 6551521000 in words is "six billion, five hundred fifty-one million, five hundred twenty-one thousand".