6557871816 has 48 divisors (see below), whose sum is σ = 17859064860. Its totient is φ = 2173875840.

The previous prime is 6557871809. The next prime is 6557871829. The reversal of 6557871816 is 6181787556.

6557871816 is a `hidden beast` number, since 6 + 557 + 8 + 7 + 1 + 81 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6552254916 + 5616900 = 80946^2 + 2370^2 .

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, 238575 + ... + 264638.

Almost surely, 2^6557871816 is an apocalyptic number.

It is an amenable number.

6557871816 is an abundant number, since it is smaller than the sum of its proper divisors (11301193044).

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

6557871816 is a wasteful number, since it uses less digits than its factorization.

6557871816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503406 (or 503399 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 54.

The square root of 6557871816 is about 80980.6879200220. The cubic root of 6557871816 is about 1871.7778678461. Note that the first 3 decimals are identical.

The spelling of 6557871816 in words is "six billion, five hundred fifty-seven million, eight hundred seventy-one thousand, eight hundred sixteen".