55687777 has 2 divisors, whose sum is σ = 55687778. Its totient is φ = 55687776.

The previous prime is 55687759. The next prime is 55687837. The reversal of 55687777 is 77778655.

55687777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41011216 + 14676561 = 6404^2 + 3831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55687777 is a prime.

It is a super-2 number, since 2×55687777² = 6202257014403458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55687757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27843888 + 27843889.

It is an arithmetic number, because the mean of its divisors is an integer number (27843889).

Almost surely, 2^55687777 is an apocalyptic number.

It is an amenable number.

55687777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55687777 is an equidigital number, since it uses as much as digits as its factorization.

55687777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2881200, while the sum is 52.

The square root of 55687777 is about 7462.4243379749. The cubic root of 55687777 is about 381.8738858930.

The spelling of 55687777 in words is "fifty-five million, six hundred eighty-seven thousand, seven hundred seventy-seven".