555766221 has 8 divisors (see below), whose sum is σ = 745929664. Its totient is φ = 368056800.

The previous prime is 555766213. The next prime is 555766249. The reversal of 555766221 is 122667555.

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

It is not a de Polignac number, because 555766221 - 2³ = 555766213 is a prime.

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 555766221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555746221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612976 + ... + 613881.

It is an arithmetic number, because the mean of its divisors is an integer number (93241208).

Almost surely, 2^555766221 is an apocalyptic number.

It is an amenable number.

555766221 is a deficient number, since it is larger than the sum of its proper divisors (190163443).

555766221 is a wasteful number, since it uses less digits than its factorization.

555766221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227011.

The product of its digits is 126000, while the sum is 39.

The square root of 555766221 is about 23574.6945049135. The cubic root of 555766221 is about 822.1745874448.

The spelling of 555766221 in words is "five hundred fifty-five million, seven hundred sixty-six thousand, two hundred twenty-one".