2557439977 has 2 divisors, whose sum is σ = 2557439978. Its totient is φ = 2557439976.

The previous prime is 2557439959. The next prime is 2557440001. The reversal of 2557439977 is 7799347552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1874976601 + 682463376 = 43301^2 + 26124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2557439977 is a prime.

It is not a weakly prime, because it can be changed into another prime (2557439947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278719988 + 1278719989.

It is an arithmetic number, because the mean of its divisors is an integer number (1278719989).

Almost surely, 2^2557439977 is an apocalyptic number.

It is an amenable number.

2557439977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557439977 is an equidigital number, since it uses as much as digits as its factorization.

2557439977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16669800, while the sum is 58.

The square root of 2557439977 is about 50571.1377862907. The cubic root of 2557439977 is about 1367.5246075737.

The spelling of 2557439977 in words is "two billion, five hundred fifty-seven million, four hundred thirty-nine thousand, nine hundred seventy-seven".