55321765567501 has 2 divisors, whose sum is σ = 55321765567502. Its totient is φ = 55321765567500.

The previous prime is 55321765567459. The next prime is 55321765567547. The reversal of 55321765567501 is 10576556712355.

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., 53502641702500 + 1819123865001 = 7314550^2 + 1348749^2 .

It is a cyclic number.

It is not a de Polignac number, because 55321765567501 - 2⁹ = 55321765566989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55321765567301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27660882783750 + 27660882783751.

It is an arithmetic number, because the mean of its divisors is an integer number (27660882783751).

Almost surely, 2^{55321765567501} is an apocalyptic number.

It is an amenable number.

55321765567501 is a deficient number, since it is larger than the sum of its proper divisors (1).

55321765567501 is an equidigital number, since it uses as much as digits as its factorization.

55321765567501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33075000, while the sum is 58.

The spelling of 55321765567501 in words is "fifty-five trillion, three hundred twenty-one billion, seven hundred sixty-five million, five hundred sixty-seven thousand, five hundred one".