6558998556 has 96 divisors (see below), whose sum is σ = 17300666880. Its totient is φ = 1915782400.

The previous prime is 6558998543. The next prime is 6558998597.

6558998556 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6558998556² = 86040924115220170272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3141745 + ... + 3143831.

It is an arithmetic number, because the mean of its divisors is an integer number (180215280).

Almost surely, 2^6558998556 is an apocalyptic number.

6558998556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6558998556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8650333440).

6558998556 is an abundant number, since it is smaller than the sum of its proper divisors (10741668324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6558998556 is a wasteful number, since it uses less digits than its factorization.

6558998556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955 (or 2953 counting only the distinct ones).

The product of its digits is 116640000, while the sum is 66.

The square root of 6558998556 is about 80987.6444650664. The cubic root of 6558998556 is about 1871.8850614744.

The spelling of 6558998556 in words is "six billion, five hundred fifty-eight million, nine hundred ninety-eight thousand, five hundred fifty-six".