2555947777 has 2 divisors, whose sum is σ = 2555947778. Its totient is φ = 2555947776.

The previous prime is 2555947747. The next prime is 2555947787. The reversal of 2555947777 is 7777495552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2411202816 + 144744961 = 49104^2 + 12031^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555947777 - 2¹¹ = 2555945729 is a prime.

It is not a weakly prime, because it can be changed into another prime (2555947747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277973888 + 1277973889.

It is an arithmetic number, because the mean of its divisors is an integer number (1277973889).

Almost surely, 2^2555947777 is an apocalyptic number.

It is an amenable number.

2555947777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555947777 is an equidigital number, since it uses as much as digits as its factorization.

2555947777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21609000, while the sum is 58.

The square root of 2555947777 is about 50556.3821589322. The cubic root of 2555947777 is about 1367.2585840958.

The spelling of 2555947777 in words is "two billion, five hundred fifty-five million, nine hundred forty-seven thousand, seven hundred seventy-seven".