7648118857 has 2 divisors, whose sum is σ = 7648118858. Its totient is φ = 7648118856.

The previous prime is 7648118789. The next prime is 7648118867. The reversal of 7648118857 is 7588118467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3971394361 + 3676724496 = 63019^2 + 60636^2 .

It is an emirp because it is prime and its reverse (7588118467) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7648118857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7648118798 and 7648118807.

It is not a weakly prime, because it can be changed into another prime (7648118867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3824059428 + 3824059429.

It is an arithmetic number, because the mean of its divisors is an integer number (3824059429).

Almost surely, 2^7648118857 is an apocalyptic number.

It is an amenable number.

7648118857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7648118857 is an equidigital number, since it uses as much as digits as its factorization.

7648118857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3010560, while the sum is 55.

The square root of 7648118857 is about 87453.5239827418. The cubic root of 7648118857 is about 1970.2358154327.

The spelling of 7648118857 in words is "seven billion, six hundred forty-eight million, one hundred eighteen thousand, eight hundred fifty-seven".