6506326640 has 80 divisors (see below), whose sum is σ = 16813897056. Its totient is φ = 2321280000.

The previous prime is 6506326633. The next prime is 6506326643. The reversal of 6506326640 is 466236056.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6506326594 and 6506326603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506326643) 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, 23111 + ... + 116390.

Almost surely, 2^6506326640 is an apocalyptic number.

It is an amenable number.

6506326640 is an abundant number, since it is smaller than the sum of its proper divisors (10307570416).

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

6506326640 is a wasteful number, since it uses less digits than its factorization.

6506326640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139578 (or 139572 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 6506326640 is about 80661.8040958668. The cubic root of 6506326640 is about 1866.8608757687.

The spelling of 6506326640 in words is "six billion, five hundred six million, three hundred twenty-six thousand, six hundred forty".