55535435561 has 2 divisors, whose sum is σ = 55535435562. Its totient is φ = 55535435560.

The previous prime is 55535435533. The next prime is 55535435621. The reversal of 55535435561 is 16553453555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53751640336 + 1783795225 = 231844^2 + 42235^2 .

It is a cyclic number.

It is not a de Polignac number, because 55535435561 - 2³⁴ = 38355566377 is a prime.

It is not a weakly prime, because it can be changed into another prime (55535435161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27767717780 + 27767717781.

It is an arithmetic number, because the mean of its divisors is an integer number (27767717781).

Almost surely, 2^55535435561 is an apocalyptic number.

It is an amenable number.

55535435561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55535435561 is an equidigital number, since it uses as much as digits as its factorization.

55535435561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3375000, while the sum is 47.

The spelling of 55535435561 in words is "fifty-five billion, five hundred thirty-five million, four hundred thirty-five thousand, five hundred sixty-one".