55195574221 has 2 divisors, whose sum is σ = 55195574222. Its totient is φ = 55195574220.

The previous prime is 55195574207. The next prime is 55195574263. The reversal of 55195574221 is 12247559155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47093774121 + 8101800100 = 217011^2 + 90010^2 .

It is a cyclic number.

It is not a de Polignac number, because 55195574221 - 2⁹ = 55195573709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55195574201) 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, 27597787110 + 27597787111.

It is an arithmetic number, because the mean of its divisors is an integer number (27597787111).

Almost surely, 2^55195574221 is an apocalyptic number.

It is an amenable number.

55195574221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55195574221 is an equidigital number, since it uses as much as digits as its factorization.

55195574221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630000, while the sum is 46.

The spelling of 55195574221 in words is "fifty-five billion, one hundred ninety-five million, five hundred seventy-four thousand, two hundred twenty-one".