6501505009985 has 8 divisors (see below), whose sum is σ = 7802199109800. Its totient is φ = 5200941942784.

The previous prime is 6501505009957. The next prime is 6501505010023. The reversal of 6501505009985 is 5899005051056.

It can be written as a sum of positive squares in 4 ways, for example, as 541066167184 + 5960438842801 = 735572^2 + 2441401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6501505009985 - 2⁸ = 6501505009729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32648960 + ... + 32847489.

It is an arithmetic number, because the mean of its divisors is an integer number (975274888725).

Almost surely, 2^{6501505009985} is an apocalyptic number.

It is an amenable number.

6501505009985 is a deficient number, since it is larger than the sum of its proper divisors (1300694099815).

6501505009985 is a wasteful number, since it uses less digits than its factorization.

6501505009985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65516307.

The product of its (nonzero) digits is 2430000, while the sum is 53.

The spelling of 6501505009985 in words is "six trillion, five hundred one billion, five hundred five million, nine thousand, nine hundred eighty-five".