6521000641 has 8 divisors (see below), whose sum is σ = 7204788864. Its totient is φ = 5870568000.

The previous prime is 6521000599. The next prime is 6521000693. The reversal of 6521000641 is 1460001256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6521000641 - 2¹³ = 6520992449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6521000341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8338485 + ... + 8339266.

It is an arithmetic number, because the mean of its divisors is an integer number (900598608).

Almost surely, 2^6521000641 is an apocalyptic number.

6521000641 is the 51073-rd centered pentagonal number.

It is an amenable number.

6521000641 is a deficient number, since it is larger than the sum of its proper divisors (683788223).

6521000641 is a wasteful number, since it uses less digits than its factorization.

6521000641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16677791.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 6521000641 is about 80752.7129017967. The cubic root of 6521000641 is about 1868.2632927856.

Adding to 6521000641 its reverse (1460001256), we get a palindrome (7981001897).

The spelling of 6521000641 in words is "six billion, five hundred twenty-one million, six hundred forty-one", and thus it is an aban number.