6981527857 has 2 divisors, whose sum is σ = 6981527858. Its totient is φ = 6981527856.

The previous prime is 6981527849. The next prime is 6981527881. The reversal of 6981527857 is 7587251896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6253013776 + 728514081 = 79076^2 + 26991^2 .

It is a cyclic number.

It is not a de Polignac number, because 6981527857 - 2³ = 6981527849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6981527807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3490763928 + 3490763929.

It is an arithmetic number, because the mean of its divisors is an integer number (3490763929).

Almost surely, 2^6981527857 is an apocalyptic number.

It is an amenable number.

6981527857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6981527857 is an equidigital number, since it uses as much as digits as its factorization.

6981527857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 58.

The square root of 6981527857 is about 83555.5375603556. The cubic root of 6981527857 is about 1911.2470367528.

The spelling of 6981527857 in words is "six billion, nine hundred eighty-one million, five hundred twenty-seven thousand, eight hundred fifty-seven".