55500505550561 has 2 divisors, whose sum is σ = 55500505550562. Its totient is φ = 55500505550560.

The previous prime is 55500505550551. The next prime is 55500505550621. The reversal of 55500505550561 is 16505550500555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37567779113536 + 17932726437025 = 6129256^2 + 4234705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55500505550561 is a prime.

It is a super-2 number, since 2×55500505550561² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55500505550551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27750252775280 + 27750252775281.

It is an arithmetic number, because the mean of its divisors is an integer number (27750252775281).

Almost surely, 2^{55500505550561} is an apocalyptic number.

It is an amenable number.

55500505550561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500505550561 is an equidigital number, since it uses as much as digits as its factorization.

55500505550561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2343750, while the sum is 47.

The spelling of 55500505550561 in words is "fifty-five trillion, five hundred billion, five hundred five million, five hundred fifty thousand, five hundred sixty-one".