55125557777 has 2 divisors, whose sum is σ = 55125557778. Its totient is φ = 55125557776.

The previous prime is 55125557761. The next prime is 55125557779. The reversal of 55125557777 is 77775552155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28886741521 + 26238816256 = 169961^2 + 161984^2 .

It is a cyclic number.

It is not a de Polignac number, because 55125557777 - 2⁴ = 55125557761 is a prime.

Together with 55125557779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55125557779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27562778888 + 27562778889.

It is an arithmetic number, because the mean of its divisors is an integer number (27562778889).

Almost surely, 2^55125557777 is an apocalyptic number.

It is an amenable number.

55125557777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55125557777 is an equidigital number, since it uses as much as digits as its factorization.

55125557777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15006250, while the sum is 56.

The spelling of 55125557777 in words is "fifty-five billion, one hundred twenty-five million, five hundred fifty-seven thousand, seven hundred seventy-seven".