55166666 has 8 divisors (see below), whose sum is σ = 87617700. Its totient is φ = 25960768.

The previous prime is 55166663. The next prime is 55166669. The reversal of 55166666 is 66666155.

55166666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55166663) and next prime (55166669).

It can be written as a sum of positive squares in 2 ways, for example, as 48011041 + 7155625 = 6929^2 + 2675^2 .

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

It is a super-2 number, since 2×55166666² = 6086722075111112, which contains 22 as substring.

55166666 is a modest number, since divided by 6666 gives 5516 as remainder.

It is not an unprimeable number, because it can be changed into a prime (55166663) 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 3 ways as a sum of consecutive naturals, for example, 811241 + ... + 811308.

Almost surely, 2^55166666 is an apocalyptic number.

55166666 is a deficient number, since it is larger than the sum of its proper divisors (32451034).

55166666 is a wasteful number, since it uses less digits than its factorization.

55166666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622568.

The product of its digits is 194400, while the sum is 41.

The square root of 55166666 is about 7427.4266068404. The cubic root of 55166666 is about 380.6789937900.

The spelling of 55166666 in words is "fifty-five million, one hundred sixty-six thousand, six hundred sixty-six".