55552223981 has 2 divisors, whose sum is σ = 55552223982. Its totient is φ = 55552223980.

The previous prime is 55552223971. The next prime is 55552224059. The reversal of 55552223981 is 18932225555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41182208356 + 14370015625 = 202934^2 + 119875^2 .

It is a cyclic number.

It is not a de Polignac number, because 55552223981 - 2¹⁴ = 55552207597 is a prime.

It is a super-2 number, since 2×55552223981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55552223911) 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 as a sum of consecutive naturals, namely, 27776111990 + 27776111991.

It is an arithmetic number, because the mean of its divisors is an integer number (27776111991).

Almost surely, 2^55552223981 is an apocalyptic number.

It is an amenable number.

55552223981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55552223981 is an equidigital number, since it uses as much as digits as its factorization.

55552223981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080000, while the sum is 47.

The spelling of 55552223981 in words is "fifty-five billion, five hundred fifty-two million, two hundred twenty-three thousand, nine hundred eighty-one".