55571543348809 has 2 divisors, whose sum is σ = 55571543348810. Its totient is φ = 55571543348808.

The previous prime is 55571543348807. The next prime is 55571543348813. The reversal of 55571543348809 is 90884334517555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41772993019209 + 13798550329600 = 6463203^2 + 3714640^2 .

It is a cyclic number.

It is not a de Polignac number, because 55571543348809 - 2¹ = 55571543348807 is a prime.

Together with 55571543348807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55571543348807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785771674404 + 27785771674405.

It is an arithmetic number, because the mean of its divisors is an integer number (27785771674405).

Almost surely, 2^{55571543348809} is an apocalyptic number.

It is an amenable number.

55571543348809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55571543348809 is an equidigital number, since it uses as much as digits as its factorization.

55571543348809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880000, while the sum is 67.

The spelling of 55571543348809 in words is "fifty-five trillion, five hundred seventy-one billion, five hundred forty-three million, three hundred forty-eight thousand, eight hundred nine".