55220266 has 16 divisors (see below), whose sum is σ = 84238344. Its totient is φ = 27143424.

The previous prime is 55220237. The next prime is 55220273. The reversal of 55220266 is 66202255.

It can be written as a sum of positive squares in 4 ways, for example, as 14630625 + 40589641 = 3825^2 + 6371^2 .

It is a super-2 number, since 2×55220266² = 6098555554221512, which contains 22 as substring.

It is an unprimeable number.

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, 89190 + ... + 89806.

Almost surely, 2^55220266 is an apocalyptic number.

55220266 is a deficient number, since it is larger than the sum of its proper divisors (29018078).

55220266 is a wasteful number, since it uses less digits than its factorization.

55220266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 55220266 is about 7431.0339791983. The cubic root of 55220266 is about 380.8022432738.

The spelling of 55220266 in words is "fifty-five million, two hundred twenty thousand, two hundred sixty-six".