55621633229 has 2 divisors, whose sum is σ = 55621633230. Its totient is φ = 55621633228.

The previous prime is 55621633187. The next prime is 55621633231. The reversal of 55621633229 is 92233612655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52989738025 + 2631895204 = 230195^2 + 51302^2 .

It is a cyclic number.

It is not a de Polignac number, because 55621633229 - 2²⁸ = 55353197773 is a prime.

It is a super-2 number, since 2×55621633229² (a number of 22 digits) contains 22 as substring.

Together with 55621633231, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55621633229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55621633279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810816614 + 27810816615.

It is an arithmetic number, because the mean of its divisors is an integer number (27810816615).

Almost surely, 2^55621633229 is an apocalyptic number.

It is an amenable number.

55621633229 is a deficient number, since it is larger than the sum of its proper divisors (1).

55621633229 is an equidigital number, since it uses as much as digits as its factorization.

55621633229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 44.

The spelling of 55621633229 in words is "fifty-five billion, six hundred twenty-one million, six hundred thirty-three thousand, two hundred twenty-nine".