55555777 has 2 divisors, whose sum is σ = 55555778. Its totient is φ = 55555776.

The previous prime is 55555771. The next prime is 55555817. The reversal of 55555777 is 77755555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38241856 + 17313921 = 6184^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555777 - 2¹⁵ = 55523009 is a prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (55555771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777888 + 27777889.

It is an arithmetic number, because the mean of its divisors is an integer number (27777889).

Almost surely, 2^55555777 is an apocalyptic number.

It is an amenable number.

55555777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55555777 is an equidigital number, since it uses as much as digits as its factorization.

55555777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071875, while the sum is 46.

The square root of 55555777 is about 7453.5747799294. The cubic root of 55555777 is about 381.5719211650.

The spelling of 55555777 in words is "fifty-five million, five hundred fifty-five thousand, seven hundred seventy-seven".