6556776557 has 8 divisors (see below), whose sum is σ = 6902980800. Its totient is φ = 6210683424.

The previous prime is 6556776553. The next prime is 6556776559. The reversal of 6556776557 is 7556776556.

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

It is a cyclic number.

It is not a de Polignac number, because 6556776557 - 2² = 6556776553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6556776496 and 6556776505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6556776553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111248 + ... + 159654.

It is an arithmetic number, because the mean of its divisors is an integer number (862872600).

Almost surely, 2^6556776557 is an apocalyptic number.

It is an amenable number.

6556776557 is a deficient number, since it is larger than the sum of its proper divisors (346204243).

6556776557 is a wasteful number, since it uses less digits than its factorization.

6556776557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555.

The product of its digits is 46305000, while the sum is 59.

The square root of 6556776557 is about 80973.9251673031. The cubic root of 6556776557 is about 1871.6736574277.

Subtracting 6556776557 from its reverse (7556776556), we obtain a palindrome (999999999).

The spelling of 6556776557 in words is "six billion, five hundred fifty-six million, seven hundred seventy-six thousand, five hundred fifty-seven".