6557021216 has 48 divisors (see below), whose sum is σ = 12984885144. Its totient is φ = 3259336704.

The previous prime is 6557021189. The next prime is 6557021231. The reversal of 6557021216 is 6121207556.

It can be written as a sum of positive squares in 4 ways, for example, as 4844716816 + 1712304400 = 69604^2 + 41380^2 .

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, 6347036 + ... + 6348068.

Almost surely, 2^6557021216 is an apocalyptic number.

It is an amenable number.

6557021216 is a deficient number, since it is larger than the sum of its proper divisors (6427863928).

6557021216 is a wasteful number, since it uses less digits than its factorization.

6557021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 6557021216 is about 80975.4358802717. The cubic root of 6557021216 is about 1871.6969369618.

The spelling of 6557021216 in words is "six billion, five hundred fifty-seven million, twenty-one thousand, two hundred sixteen".