55000505005561 has 2 divisors, whose sum is σ = 55000505005562. Its totient is φ = 55000505005560.

The previous prime is 55000505005543. The next prime is 55000505005571. The reversal of 55000505005561 is 16550050500055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53605167618025 + 1395337387536 = 7321555^2 + 1181244^2 .

It is a cyclic number.

It is not a de Polignac number, because 55000505005561 - 2¹³ = 55000504997369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55000505005561.

It is not a weakly prime, because it can be changed into another prime (55000505005571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27500252502780 + 27500252502781.

It is an arithmetic number, because the mean of its divisors is an integer number (27500252502781).

Almost surely, 2^{55000505005561} is an apocalyptic number.

It is an amenable number.

55000505005561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55000505005561 is an equidigital number, since it uses as much as digits as its factorization.

55000505005561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 55000505005561 in words is "fifty-five trillion, five hundred five million, five thousand, five hundred sixty-one".