6557877866 has 8 divisors (see below), whose sum is σ = 9863190084. Its totient is φ = 3270147840.

The previous prime is 6557877731. The next prime is 6557877913. The reversal of 6557877866 is 6687787556.

It can be written as a sum of positive squares in 2 ways, for example, as 6556302841 + 1575025 = 80971^2 + 1255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4394615 + ... + 4396106.

Almost surely, 2^6557877866 is an apocalyptic number.

6557877866 is a deficient number, since it is larger than the sum of its proper divisors (3305312218).

6557877866 is a wasteful number, since it uses less digits than its factorization.

6557877866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8791096.

The product of its digits is 118540800, while the sum is 65.

The square root of 6557877866 is about 80980.7252745985. The cubic root of 6557877866 is about 1871.7784434522.

The spelling of 6557877866 in words is "six billion, five hundred fifty-seven million, eight hundred seventy-seven thousand, eight hundred sixty-six".