2865815257 has 2 divisors, whose sum is σ = 2865815258. Its totient is φ = 2865815256.

The previous prime is 2865815237. The next prime is 2865815269. The reversal of 2865815257 is 7525185682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2591217216 + 274598041 = 50904^2 + 16571^2 .

It is a cyclic number.

It is not a de Polignac number, because 2865815257 - 2¹⁹ = 2865290969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2865815257.

It is not a weakly prime, because it can be changed into another prime (2865815207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1432907628 + 1432907629.

It is an arithmetic number, because the mean of its divisors is an integer number (1432907629).

Almost surely, 2^2865815257 is an apocalyptic number.

It is an amenable number.

2865815257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2865815257 is an equidigital number, since it uses as much as digits as its factorization.

2865815257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 49.

The square root of 2865815257 is about 53533.3097893265. The cubic root of 2865815257 is about 1420.4176608164.

The spelling of 2865815257 in words is "two billion, eight hundred sixty-five million, eight hundred fifteen thousand, two hundred fifty-seven".