55637546421481 has 2 divisors, whose sum is σ = 55637546421482. Its totient is φ = 55637546421480.

The previous prime is 55637546421469. The next prime is 55637546421601. The reversal of 55637546421481 is 18412464573655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43659267690256 + 11978278731225 = 6607516^2 + 3460965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55637546421481 is a prime.

It is a super-2 number, since 2×55637546421481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55637546421781) 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, 27818773210740 + 27818773210741.

It is an arithmetic number, because the mean of its divisors is an integer number (27818773210741).

Almost surely, 2^{55637546421481} is an apocalyptic number.

It is an amenable number.

55637546421481 is a deficient number, since it is larger than the sum of its proper divisors (1).

55637546421481 is an equidigital number, since it uses as much as digits as its factorization.

55637546421481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768000, while the sum is 61.

The spelling of 55637546421481 in words is "fifty-five trillion, six hundred thirty-seven billion, five hundred forty-six million, four hundred twenty-one thousand, four hundred eighty-one".