55591500197 has 2 divisors, whose sum is σ = 55591500198. Its totient is φ = 55591500196.

The previous prime is 55591500179. The next prime is 55591500259. The reversal of 55591500197 is 79100519555.

It is a happy number.

Together with previous prime (55591500179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48681568321 + 6909931876 = 220639^2 + 83126^2 .

It is a cyclic number.

It is not a de Polignac number, because 55591500197 - 2⁸ = 55591499941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55591500157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27795750098 + 27795750099.

It is an arithmetic number, because the mean of its divisors is an integer number (27795750099).

Almost surely, 2^55591500197 is an apocalyptic number.

It is an amenable number.

55591500197 is a deficient number, since it is larger than the sum of its proper divisors (1).

55591500197 is an equidigital number, since it uses as much as digits as its factorization.

55591500197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 354375, while the sum is 47.

The spelling of 55591500197 in words is "fifty-five billion, five hundred ninety-one million, five hundred thousand, one hundred ninety-seven".