55577726777 has 2 divisors, whose sum is σ = 55577726778. Its totient is φ = 55577726776.

The previous prime is 55577726767. The next prime is 55577726851. The reversal of 55577726777 is 77762777555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55575233536 + 2493241 = 235744^2 + 1579^2 .

It is a cyclic number.

It is not a de Polignac number, because 55577726777 - 2²⁶ = 55510617913 is a prime.

It is not a weakly prime, because it can be changed into another prime (55577726707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27788863388 + 27788863389.

It is an arithmetic number, because the mean of its divisors is an integer number (27788863389).

Almost surely, 2^55577726777 is an apocalyptic number.

It is an amenable number.

55577726777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55577726777 is an equidigital number, since it uses as much as digits as its factorization.

55577726777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176473500, while the sum is 65.

The spelling of 55577726777 in words is "fifty-five billion, five hundred seventy-seven million, seven hundred twenty-six thousand, seven hundred seventy-seven".