55681065709 has 2 divisors, whose sum is σ = 55681065710. Its totient is φ = 55681065708.

The previous prime is 55681065697. The next prime is 55681065757. The reversal of 55681065709 is 90756018655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49760224900 + 5920840809 = 223070^2 + 76947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55681065709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55681065799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27840532854 + 27840532855.

It is an arithmetic number, because the mean of its divisors is an integer number (27840532855).

Almost surely, 2^55681065709 is an apocalyptic number.

It is an amenable number.

55681065709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55681065709 is an equidigital number, since it uses as much as digits as its factorization.

55681065709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 52.

The spelling of 55681065709 in words is "fifty-five billion, six hundred eighty-one million, sixty-five thousand, seven hundred nine".