55591216697 has 2 divisors, whose sum is σ = 55591216698. Its totient is φ = 55591216696.

The previous prime is 55591216669. The next prime is 55591216717. The reversal of 55591216697 is 79661219555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35353024576 + 20238192121 = 188024^2 + 142261^2 .

It is a cyclic number.

It is not a de Polignac number, because 55591216697 - 2¹⁸ = 55590954553 is a prime.

It is not a weakly prime, because it can be changed into another prime (55591216607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27795608348 + 27795608349.

It is an arithmetic number, because the mean of its divisors is an integer number (27795608349).

Almost surely, 2^55591216697 is an apocalyptic number.

It is an amenable number.

55591216697 is a deficient number, since it is larger than the sum of its proper divisors (1).

55591216697 is an equidigital number, since it uses as much as digits as its factorization.

55591216697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103000, while the sum is 56.

The spelling of 55591216697 in words is "fifty-five billion, five hundred ninety-one million, two hundred sixteen thousand, six hundred ninety-seven".