7278557057 has 2 divisors, whose sum is σ = 7278557058. Its totient is φ = 7278557056.

The previous prime is 7278557003. The next prime is 7278557059. The reversal of 7278557057 is 7507558727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5697381361 + 1581175696 = 75481^2 + 39764^2 .

It is a cyclic number.

It is not a de Polignac number, because 7278557057 - 2¹⁴ = 7278540673 is a prime.

Together with 7278557059, 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 (7278557059) 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, 3639278528 + 3639278529.

It is an arithmetic number, because the mean of its divisors is an integer number (3639278529).

Almost surely, 2^7278557057 is an apocalyptic number.

It is an amenable number.

7278557057 is a deficient number, since it is larger than the sum of its proper divisors (1).

7278557057 is an equidigital number, since it uses as much as digits as its factorization.

7278557057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4802000, while the sum is 53.

The square root of 7278557057 is about 85314.4598353644. The cubic root of 7278557057 is about 1937.9761599697.

The spelling of 7278557057 in words is "seven billion, two hundred seventy-eight million, five hundred fifty-seven thousand, fifty-seven".