55021966 has 4 divisors (see below), whose sum is σ = 82532952. Its totient is φ = 27510982.

The previous prime is 55021949. The next prime is 55021969. The reversal of 55021966 is 66912055.

It is a happy number.

55021966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55021969) 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 as a sum of consecutive naturals, namely, 13755490 + ... + 13755493.

It is an arithmetic number, because the mean of its divisors is an integer number (20633238).

Almost surely, 2^55021966 is an apocalyptic number.

55021966 is a deficient number, since it is larger than the sum of its proper divisors (27510986).

55021966 is a wasteful number, since it uses less digits than its factorization.

55021966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27510985.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 55021966 is about 7417.6792866772. The cubic root of 55021966 is about 380.3458670067.

The spelling of 55021966 in words is "fifty-five million, twenty-one thousand, nine hundred sixty-six".