7865257811 has 2 divisors, whose sum is σ = 7865257812. Its totient is φ = 7865257810.

The previous prime is 7865257793. The next prime is 7865257819. The reversal of 7865257811 is 1187525687.

It is a strong prime.

It is an emirp because it is prime and its reverse (1187525687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7865257811 - 2¹⁰ = 7865256787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7865257811.

It is not a weakly prime, because it can be changed into another prime (7865257819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932628905 + 3932628906.

It is an arithmetic number, because the mean of its divisors is an integer number (3932628906).

Almost surely, 2^7865257811 is an apocalyptic number.

7865257811 is a deficient number, since it is larger than the sum of its proper divisors (1).

7865257811 is an equidigital number, since it uses as much as digits as its factorization.

7865257811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 940800, while the sum is 50.

The square root of 7865257811 is about 88686.2887429618. The cubic root of 7865257811 is about 1988.7078478914.

The spelling of 7865257811 in words is "seven billion, eight hundred sixty-five million, two hundred fifty-seven thousand, eight hundred eleven".