6557679578 has 16 divisors (see below), whose sum is σ = 10211947560. Its totient is φ = 3154502400.

The previous prime is 6557679563. The next prime is 6557679599. The reversal of 6557679578 is 8759767556.

It can be written as a sum of positive squares in 4 ways, for example, as 5084117809 + 1473561769 = 71303^2 + 38387^2 .

It is a super-2 number, since 2×6557679578² = 86006322895436516168, which contains 22 as substring.

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, 184883 + ... + 217478.

Almost surely, 2^6557679578 is an apocalyptic number.

6557679578 is a deficient number, since it is larger than the sum of its proper divisors (3654267982).

6557679578 is a wasteful number, since it uses less digits than its factorization.

6557679578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402673.

The product of its digits is 111132000, while the sum is 65.

The square root of 6557679578 is about 80979.5009740119. The cubic root of 6557679578 is about 1871.7595778500.

The spelling of 6557679578 in words is "six billion, five hundred fifty-seven million, six hundred seventy-nine thousand, five hundred seventy-eight".