55021066 has 4 divisors (see below), whose sum is σ = 82531602. Its totient is φ = 27510532.

The previous prime is 55021039. The next prime is 55021069. The reversal of 55021066 is 66012055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66012055 = 5 ⋅13202411.

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 6426225 = 6971^2 + 2535^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55021066.

It is not an unprimeable number, because it can be changed into a prime (55021069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13755265 + ... + 13755268.

Almost surely, 2^55021066 is an apocalyptic number.

55021066 is a deficient number, since it is larger than the sum of its proper divisors (27510536).

55021066 is a wasteful number, since it uses less digits than its factorization.

55021066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27510535.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55021066 is about 7417.6186205547. The cubic root of 55021066 is about 380.3437932098.

The spelling of 55021066 in words is "fifty-five million, twenty-one thousand, sixty-six".