55605505555511 has 2 divisors, whose sum is σ = 55605505555512. Its totient is φ = 55605505555510.

The previous prime is 55605505555451. The next prime is 55605505555529. The reversal of 55605505555511 is 11555550550655.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55605505555511 - 2²⁶ = 55605438446647 is a prime.

It is a super-2 number, since 2×55605505555511² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55605505555541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27802752777755 + 27802752777756.

It is an arithmetic number, because the mean of its divisors is an integer number (27802752777756).

Almost surely, 2^{55605505555511} is an apocalyptic number.

55605505555511 is a deficient number, since it is larger than the sum of its proper divisors (1).

55605505555511 is an equidigital number, since it uses as much as digits as its factorization.

55605505555511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11718750, while the sum is 53.

The spelling of 55605505555511 in words is "fifty-five trillion, six hundred five billion, five hundred five million, five hundred fifty-five thousand, five hundred eleven".