556546221 has 160 divisors (see below), whose sum is σ = 1141620480. Its totient is φ = 261273600.

The previous prime is 556546219. The next prime is 556546241. The reversal of 556546221 is 122645655.

It is not a de Polignac number, because 556546221 - 2¹ = 556546219 is a prime.

It is a super-2 number, since 2×556546221² = 619487392218761682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556546241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3074751 + ... + 3074931.

It is an arithmetic number, because the mean of its divisors is an integer number (7135128).

Almost surely, 2^556546221 is an apocalyptic number.

556546221 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

556546221 is an abundant number, since it is smaller than the sum of its proper divisors (585074259).

556546221 is a wasteful number, since it uses less digits than its factorization.

556546221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 248 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 556546221 is about 23591.2318669458. The cubic root of 556546221 is about 822.5590395008.

The spelling of 556546221 in words is "five hundred fifty-six million, five hundred forty-six thousand, two hundred twenty-one".