6501660 has 48 divisors (see below), whose sum is σ = 19861632. Its totient is φ = 1576000.

The previous prime is 6501647. The next prime is 6501689. The reversal of 6501660 is 661056.

6501660 = 898² + 899² + ... + 905².

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 6501660.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4266 + ... + 5585.

It is an arithmetic number, because the mean of its divisors is an integer number (413784).

Almost surely, 2^6501660 is an apocalyptic number.

6501660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6501660 is an abundant number, since it is smaller than the sum of its proper divisors (13359972).

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

6501660 is a wasteful number, since it uses less digits than its factorization.

6501660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874 (or 9872 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 6501660 is about 2549.8352887981. The cubic root of 6501660 is about 186.6414435874.

The spelling of 6501660 in words is "six million, five hundred one thousand, six hundred sixty".