55611116861 has 2 divisors, whose sum is σ = 55611116862. Its totient is φ = 55611116860.

The previous prime is 55611116767. The next prime is 55611116863. The reversal of 55611116861 is 16861111655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45654868900 + 9956247961 = 213670^2 + 99781^2 .

It is a cyclic number.

It is not a de Polignac number, because 55611116861 - 2²⁶ = 55544007997 is a prime.

Together with 55611116863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55611116863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27805558430 + 27805558431.

It is an arithmetic number, because the mean of its divisors is an integer number (27805558431).

Almost surely, 2^55611116861 is an apocalyptic number.

It is an amenable number.

55611116861 is a deficient number, since it is larger than the sum of its proper divisors (1).

55611116861 is an equidigital number, since it uses as much as digits as its factorization.

55611116861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 41.

The spelling of 55611116861 in words is "fifty-five billion, six hundred eleven million, one hundred sixteen thousand, eight hundred sixty-one".