6501611500 has 48 divisors (see below), whose sum is σ = 14689190880. Its totient is φ = 2510961600.

The previous prime is 6501611489. The next prime is 6501611533. The reversal of 6501611500 is 51161056.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209694 + ... + 238693.

It is an arithmetic number, because the mean of its divisors is an integer number (306024810).

Almost surely, 2^6501611500 is an apocalyptic number.

It is an amenable number.

6501611500 is an abundant number, since it is smaller than the sum of its proper divisors (8187579380).

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

6501611500 is a wasteful number, since it uses less digits than its factorization.

6501611500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448435 (or 448423 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 6501611500 is about 80632.5709623599. The cubic root of 6501611500 is about 1866.4097949398.

Adding to 6501611500 its reverse (51161056), we get a palindrome (6552772556).

The spelling of 6501611500 in words is "six billion, five hundred one million, six hundred eleven thousand, five hundred".