6500051640 has 48 divisors (see below), whose sum is σ = 21125169000. Its totient is φ = 1733347008.

The previous prime is 6500051629. The next prime is 6500051659. The reversal of 6500051640 is 461500056.

It is a happy number.

6500051640 is a `hidden beast` number, since 650 + 0 + 0 + 5 + 1 + 6 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9027490 + ... + 9028209.

Almost surely, 2^6500051640 is an apocalyptic number.

6500051640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6500051640 is an abundant number, since it is smaller than the sum of its proper divisors (14625117360).

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

6500051640 is a wasteful number, since it uses less digits than its factorization.

6500051640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055716 (or 18055709 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6500051640 is about 80622.8977400341. The cubic root of 6500051640 is about 1866.2605206231.

Adding to 6500051640 its reverse (461500056), we get a palindrome (6961551696).

The spelling of 6500051640 in words is "six billion, five hundred million, fifty-one thousand, six hundred forty".