55590721481 has 2 divisors, whose sum is σ = 55590721482. Its totient is φ = 55590721480.

The previous prime is 55590721477. The next prime is 55590721513. The reversal of 55590721481 is 18412709555.

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., 34415815225 + 21174906256 = 185515^2 + 145516^2 .

It is a cyclic number.

It is not a de Polignac number, because 55590721481 - 2² = 55590721477 is a prime.

It is a super-2 number, since 2×55590721481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55590721421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27795360740 + 27795360741.

It is an arithmetic number, because the mean of its divisors is an integer number (27795360741).

Almost surely, 2^55590721481 is an apocalyptic number.

It is an amenable number.

55590721481 is a deficient number, since it is larger than the sum of its proper divisors (1).

55590721481 is an equidigital number, since it uses as much as digits as its factorization.

55590721481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 55590721481 in words is "fifty-five billion, five hundred ninety million, seven hundred twenty-one thousand, four hundred eighty-one".