55221663443 has 4 divisors (see below), whose sum is σ = 55768412688. Its totient is φ = 54674914200.

The previous prime is 55221663437. The next prime is 55221663449. The reversal of 55221663443 is 34436612255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34436612255 = 5 ⋅6887322451.

It is an interprime number because it is at equal distance from previous prime (55221663437) and next prime (55221663449).

It is a cyclic number.

It is not a de Polignac number, because 55221663443 - 2¹² = 55221659347 is a prime.

It is a super-2 number, since 2×55221663443² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55221663443.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273374471 + ... + 273374672.

It is an arithmetic number, because the mean of its divisors is an integer number (13942103172).

Almost surely, 2^55221663443 is an apocalyptic number.

55221663443 is a deficient number, since it is larger than the sum of its proper divisors (546749245).

55221663443 is a wasteful number, since it uses less digits than its factorization.

55221663443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546749244.

The product of its digits is 518400, while the sum is 41.

The spelling of 55221663443 in words is "fifty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-three".