55221663444 has 24 divisors (see below), whose sum is σ = 130773692448. Its totient is φ = 18132486240.

The previous prime is 55221663437. The next prime is 55221663449. The reversal of 55221663444 is 44436612255.

It is a happy number.

It is a super-2 number, since 2×55221663444² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55221663396 and 55221663405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221663449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34341027 + ... + 34342634.

It is an arithmetic number, because the mean of its divisors is an integer number (5448903852).

Almost surely, 2^55221663444 is an apocalyptic number.

It is an amenable number.

55221663444 is an abundant number, since it is smaller than the sum of its proper divisors (75552029004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55221663444 is a wasteful number, since it uses less digits than its factorization.

55221663444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68683735 (or 68683733 counting only the distinct ones).

The product of its digits is 691200, while the sum is 42.

The spelling of 55221663444 in words is "fifty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-four".