6556118377 has 4 divisors (see below), whose sum is σ = 6561615060. Its totient is φ = 6550621696.

The previous prime is 6556118369. The next prime is 6556118381. The reversal of 6556118377 is 7738116556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5186304256 + 1369814121 = 72016^2 + 37011^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556118377 - 2³ = 6556118369 is a prime.

It is a super-2 number, since 2×6556118377² = 85965376346474228258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6556118377.

It is not an unprimeable number, because it can be changed into a prime (6556118077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2746552 + ... + 2748937.

It is an arithmetic number, because the mean of its divisors is an integer number (1640403765).

Almost surely, 2^6556118377 is an apocalyptic number.

It is an amenable number.

6556118377 is a deficient number, since it is larger than the sum of its proper divisors (5496683).

6556118377 is a wasteful number, since it uses less digits than its factorization.

6556118377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496682.

The product of its digits is 1058400, while the sum is 49.

The square root of 6556118377 is about 80969.8609175044. The cubic root of 6556118377 is about 1871.6110281068.

It can be divided in two parts, 65561 and 18377, that added together give a palindrome (83938).

The spelling of 6556118377 in words is "six billion, five hundred fifty-six million, one hundred eighteen thousand, three hundred seventy-seven".