6555445557 has 8 divisors (see below), whose sum is σ = 8871050976. Its totient is φ = 4305068592.

The previous prime is 6555445543. The next prime is 6555445619. The reversal of 6555445557 is 7555445556.

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

It is not a de Polignac number, because 6555445557 - 2⁴ = 6555445541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555445357) 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, 16306878 + ... + 16307279.

It is an arithmetic number, because the mean of its divisors is an integer number (1108881372).

Almost surely, 2^6555445557 is an apocalyptic number.

6555445557 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

6555445557 is a deficient number, since it is larger than the sum of its proper divisors (2315605419).

6555445557 is a wasteful number, since it uses less digits than its factorization.

6555445557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32614227.

The product of its digits is 10500000, while the sum is 51.

The square root of 6555445557 is about 80965.7060550947. The cubic root of 6555445557 is about 1871.5470013794.

Subtracting 6555445557 from its reverse (7555445556), we obtain a palindrome (999999999).

It can be divided in two parts, 65554 and 45557, that added together give a palindrome (111111).

The spelling of 6555445557 in words is "six billion, five hundred fifty-five million, four hundred forty-five thousand, five hundred fifty-seven".