55666771 has 2 divisors, whose sum is σ = 55666772. Its totient is φ = 55666770.

The previous prime is 55666763. The next prime is 55666813. The reversal of 55666771 is 17766655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55666771 - 2³ = 55666763 is a prime.

It is not a weakly prime, because it can be changed into another prime (55666711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833385 + 27833386.

It is an arithmetic number, because the mean of its divisors is an integer number (27833386).

Almost surely, 2^55666771 is an apocalyptic number.

55666771 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666771 is an equidigital number, since it uses as much as digits as its factorization.

55666771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 43.

The square root of 55666771 is about 7461.0167537675. The cubic root of 55666771 is about 381.8258642737.

The spelling of 55666771 in words is "fifty-five million, six hundred sixty-six thousand, seven hundred seventy-one".