55475445056021 has 2 divisors, whose sum is σ = 55475445056022. Its totient is φ = 55475445056020.

The previous prime is 55475445055963. The next prime is 55475445056077. The reversal of 55475445056021 is 12065054457455.

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., 49057907098225 + 6417537957796 = 7004135^2 + 2533286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55475445056021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55475445056821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27737722528010 + 27737722528011.

It is an arithmetic number, because the mean of its divisors is an integer number (27737722528011).

Almost surely, 2^{55475445056021} is an apocalyptic number.

It is an amenable number.

55475445056021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55475445056021 is an equidigital number, since it uses as much as digits as its factorization.

55475445056021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800000, while the sum is 53.

The spelling of 55475445056021 in words is "fifty-five trillion, four hundred seventy-five billion, four hundred forty-five million, fifty-six thousand, twenty-one".