6505420821804 has 36 divisors (see below), whose sum is σ = 16444488966360. Its totient is φ = 2168443175040.

The previous prime is 6505420821791. The next prime is 6505420821821. The reversal of 6505420821804 is 4081280245056.

6505420821804 is a `hidden beast` number, since 6 + 5 + 0 + 5 + 420 + 8 + 218 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6505420821804² (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 6505420821804.

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, 1410324 + ... + 3872964.

Almost surely, 2^{6505420821804} is an apocalyptic number.

It is an amenable number.

6505420821804 is an abundant number, since it is smaller than the sum of its proper divisors (9939068144556).

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

6505420821804 is a wasteful number, since it uses less digits than its factorization.

6505420821804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536030 (or 2536025 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 6505420821804 in words is "six trillion, five hundred five billion, four hundred twenty million, eight hundred twenty-one thousand, eight hundred four".