55221663442 has 32 divisors (see below), whose sum is σ = 94458470400. Its totient is φ = 23983549200.

The previous prime is 55221663437. The next prime is 55221663449. The reversal of 55221663442 is 24436612255.

It is a happy number.

It is a super-2 number, since 2×55221663442² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55221663395 and 55221663404.

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 15 ways as a sum of consecutive naturals, for example, 458592 + ... + 566347.

It is an arithmetic number, because the mean of its divisors is an integer number (2951827200).

Almost surely, 2^55221663442 is an apocalyptic number.

55221663442 is a deficient number, since it is larger than the sum of its proper divisors (39236806958).

55221663442 is a wasteful number, since it uses less digits than its factorization.

55221663442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025062.

The product of its digits is 345600, while the sum is 40.

The spelling of 55221663442 in words is "fifty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-two".