551221066 has 24 divisors (see below), whose sum is σ = 917213220. Its totient is φ = 248244480.

The previous prime is 551221063. The next prime is 551221117. The reversal of 551221066 is 660122155.

It can be written as a sum of positive squares in 2 ways, for example, as 539214841 + 12006225 = 23221^2 + 3465^2 .

It is not an unprimeable number, because it can be changed into a prime (551221063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15930 + ... + 36826.

Almost surely, 2^551221066 is an apocalyptic number.

551221066 is a deficient number, since it is larger than the sum of its proper divisors (365992154).

551221066 is a wasteful number, since it uses less digits than its factorization.

551221066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21030 (or 21019 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 551221066 is about 23478.0975805111. The cubic root of 551221066 is about 819.9271529575.

The spelling of 551221066 in words is "five hundred fifty-one million, two hundred twenty-one thousand, sixty-six".