55581621041 has 2 divisors, whose sum is σ = 55581621042. Its totient is φ = 55581621040.

The previous prime is 55581620981. The next prime is 55581621103. The reversal of 55581621041 is 14012618555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31233139441 + 24348481600 = 176729^2 + 156040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55581621041 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55581620986 and 55581621004.

It is not a weakly prime, because it can be changed into another prime (55581620041) 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, 27790810520 + 27790810521.

It is an arithmetic number, because the mean of its divisors is an integer number (27790810521).

Almost surely, 2^55581621041 is an apocalyptic number.

It is an amenable number.

55581621041 is a deficient number, since it is larger than the sum of its proper divisors (1).

55581621041 is an equidigital number, since it uses as much as digits as its factorization.

55581621041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 38.

The spelling of 55581621041 in words is "fifty-five billion, five hundred eighty-one million, six hundred twenty-one thousand, forty-one".