55120777 has 2 divisors, whose sum is σ = 55120778. Its totient is φ = 55120776.

The previous prime is 55120753. The next prime is 55120789. The reversal of 55120777 is 77702155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42758521 + 12362256 = 6539^2 + 3516^2 .

It is a cyclic number.

It is not a de Polignac number, because 55120777 - 2¹⁵ = 55088009 is a prime.

It is not a weakly prime, because it can be changed into another prime (55124777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27560388 + 27560389.

It is an arithmetic number, because the mean of its divisors is an integer number (27560389).

Almost surely, 2^55120777 is an apocalyptic number.

It is an amenable number.

55120777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55120777 is an equidigital number, since it uses as much as digits as its factorization.

55120777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 55120777 is about 7424.3368053988. The cubic root of 55120777 is about 380.5734117688.

The spelling of 55120777 in words is "fifty-five million, one hundred twenty thousand, seven hundred seventy-seven".