6555016500021 has 24 divisors (see below), whose sum is σ = 10398439864800. Its totient is φ = 3946074597600.

The previous prime is 6555016500007. The next prime is 6555016500031. The reversal of 6555016500021 is 1200056105556.

It is not a de Polignac number, because 6555016500021 - 2⁵ = 6555016499989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555016500001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222174135 + ... + 222203636.

It is an arithmetic number, because the mean of its divisors is an integer number (433268327700).

Almost surely, 2^{6555016500021} is an apocalyptic number.

It is an amenable number.

6555016500021 is a deficient number, since it is larger than the sum of its proper divisors (3843423364779).

6555016500021 is a wasteful number, since it uses less digits than its factorization.

6555016500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444377937 (or 444377934 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 6555016500021 in words is "six trillion, five hundred fifty-five billion, sixteen million, five hundred thousand, twenty-one".