2865205663 has 2 divisors, whose sum is σ = 2865205664. Its totient is φ = 2865205662.

The previous prime is 2865205631. The next prime is 2865205723. The reversal of 2865205663 is 3665025682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2865205663 - 2⁵ = 2865205631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2865275663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1432602831 + 1432602832.

It is an arithmetic number, because the mean of its divisors is an integer number (1432602832).

Almost surely, 2^2865205663 is an apocalyptic number.

2865205663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2865205663 is an equidigital number, since it uses as much as digits as its factorization.

2865205663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 2865205663 is about 53527.6158912388. The cubic root of 2865205663 is about 1420.3169402642.

The spelling of 2865205663 in words is "two billion, eight hundred sixty-five million, two hundred five thousand, six hundred sixty-three".