7871963857 has 2 divisors, whose sum is σ = 7871963858. Its totient is φ = 7871963856.

The previous prime is 7871963851. The next prime is 7871963863. The reversal of 7871963857 is 7583691787.

It is a balanced prime because it is at equal distance from previous prime (7871963851) and next prime (7871963863).

It can be written as a sum of positive squares in only one way, i.e., 7552305216 + 319658641 = 86904^2 + 17879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7871963857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7871963795 and 7871963804.

It is not a weakly prime, because it can be changed into another prime (7871963851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935981928 + 3935981929.

It is an arithmetic number, because the mean of its divisors is an integer number (3935981929).

Almost surely, 2^7871963857 is an apocalyptic number.

It is an amenable number.

7871963857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7871963857 is an equidigital number, since it uses as much as digits as its factorization.

7871963857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 61.

The square root of 7871963857 is about 88724.0883695065. The cubic root of 7871963857 is about 1989.2728888245.

The spelling of 7871963857 in words is "seven billion, eight hundred seventy-one million, nine hundred sixty-three thousand, eight hundred fifty-seven".