7957940857 has 2 divisors, whose sum is σ = 7957940858. Its totient is φ = 7957940856.

The previous prime is 7957940843. The next prime is 7957940869. The reversal of 7957940857 is 7580497597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7706908521 + 251032336 = 87789^2 + 15844^2 .

It is a cyclic number.

It is not a de Polignac number, because 7957940857 - 2¹⁹ = 7957416569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7957940795 and 7957940804.

It is not a weakly prime, because it can be changed into another prime (7957940657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3978970428 + 3978970429.

It is an arithmetic number, because the mean of its divisors is an integer number (3978970429).

Almost surely, 2^7957940857 is an apocalyptic number.

It is an amenable number.

7957940857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7957940857 is an equidigital number, since it uses as much as digits as its factorization.

7957940857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22226400, while the sum is 61.

The square root of 7957940857 is about 89207.2915013117. The cubic root of 7957940857 is about 1996.4889111512.

The spelling of 7957940857 in words is "seven billion, nine hundred fifty-seven million, nine hundred forty thousand, eight hundred fifty-seven".