6521000340 has 48 divisors (see below), whose sum is σ = 18263250432. Its totient is φ = 1738509696.

The previous prime is 6521000303. The next prime is 6521000341. The reversal of 6521000340 is 430001256.

It is a happy number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 293917 + ... + 315323.

It is an arithmetic number, because the mean of its divisors is an integer number (380484384).

Almost surely, 2^6521000340 is an apocalyptic number.

6521000340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6521000340 is an abundant number, since it is smaller than the sum of its proper divisors (11742250092).

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

6521000340 is a wasteful number, since it uses less digits than its factorization.

6521000340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26496 (or 26494 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6521000340 is about 80752.7110380822. The cubic root of 6521000340 is about 1868.2632640401.

Adding to 6521000340 its reverse (430001256), we get a palindrome (6951001596).

The spelling of 6521000340 in words is "six billion, five hundred twenty-one million, three hundred forty", and thus it is an aban number.