6988981057 has 2 divisors, whose sum is σ = 6988981058. Its totient is φ = 6988981056.

The previous prime is 6988981039. The next prime is 6988981067. The reversal of 6988981057 is 7501898896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3941830656 + 3047150401 = 62784^2 + 55201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6988981057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6988980986 and 6988981004.

It is not a weakly prime, because it can be changed into another prime (6988981007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494490528 + 3494490529.

It is an arithmetic number, because the mean of its divisors is an integer number (3494490529).

Almost surely, 2^6988981057 is an apocalyptic number.

It is an amenable number.

6988981057 is a deficient number, since it is larger than the sum of its proper divisors (1).

6988981057 is an equidigital number, since it uses as much as digits as its factorization.

6988981057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 61.

The square root of 6988981057 is about 83600.1259389004. The cubic root of 6988981057 is about 1911.9269185119.

The spelling of 6988981057 in words is "six billion, nine hundred eighty-eight million, nine hundred eighty-one thousand, fifty-seven".