55536221729 has 2 divisors, whose sum is σ = 55536221730. Its totient is φ = 55536221728.

The previous prime is 55536221711. The next prime is 55536221731. The reversal of 55536221729 is 92712263555.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38318845504 + 17217376225 = 195752^2 + 131215^2 .

It is a cyclic number.

It is not a de Polignac number, because 55536221729 - 2²⁰ = 55535173153 is a prime.

Together with 55536221731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55536221749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27768110864 + 27768110865.

It is an arithmetic number, because the mean of its divisors is an integer number (27768110865).

Almost surely, 2^55536221729 is an apocalyptic number.

It is an amenable number.

55536221729 is a deficient number, since it is larger than the sum of its proper divisors (1).

55536221729 is an equidigital number, since it uses as much as digits as its factorization.

55536221729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 47.

The spelling of 55536221729 in words is "fifty-five billion, five hundred thirty-six million, two hundred twenty-one thousand, seven hundred twenty-nine".