1755561378211 has 2 divisors, whose sum is σ = 1755561378212. Its totient is φ = 1755561378210.

The previous prime is 1755561378121. The next prime is 1755561378227. The reversal of 1755561378211 is 1128731655571.

Together with previous prime (1755561378121) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1755561378211 - 2²⁵ = 1755527823779 is a prime.

It is a super-2 number, since 2×1755561378211² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1755561379211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877780689105 + 877780689106.

It is an arithmetic number, because the mean of its divisors is an integer number (877780689106).

Almost surely, 2^{1755561378211} is an apocalyptic number.

1755561378211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1755561378211 is an equidigital number, since it uses as much as digits as its factorization.

1755561378211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 52.

The spelling of 1755561378211 in words is "one trillion, seven hundred fifty-five billion, five hundred sixty-one million, three hundred seventy-eight thousand, two hundred eleven".