6504721004721 has 32 divisors (see below), whose sum is σ = 9159648003072. Its totient is φ = 4097710232000.

The previous prime is 6504721004711. The next prime is 6504721004819. The reversal of 6504721004721 is 1274001274056.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6504721004721 is a prime.

It is a super-2 number, since 2×6504721004721² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6504721004721.

It is not an unprimeable number, because it can be changed into a prime (6504721004711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146147971 + ... + 146192471.

It is an arithmetic number, because the mean of its divisors is an integer number (286239000096).

Almost surely, 2^{6504721004721} is an apocalyptic number.

It is an amenable number.

6504721004721 is a deficient number, since it is larger than the sum of its proper divisors (2654926998351).

6504721004721 is a wasteful number, since it uses less digits than its factorization.

6504721004721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70133.

The product of its (nonzero) digits is 94080, while the sum is 39.

Adding to 6504721004721 its reverse (1274001274056), we get a palindrome (7778722278777).

The spelling of 6504721004721 in words is "six trillion, five hundred four billion, seven hundred twenty-one million, four thousand, seven hundred twenty-one".