2265516778 has 16 divisors (see below), whose sum is σ = 3920042304. Its totient is φ = 961860960.

The previous prime is 2265516763. The next prime is 2265516793. The reversal of 2265516778 is 8776155622.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2265516763) and next prime (2265516793).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754683 + ... + 757678.

It is an arithmetic number, because the mean of its divisors is an integer number (245002644).

Almost surely, 2^2265516778 is an apocalyptic number.

2265516778 is a deficient number, since it is larger than the sum of its proper divisors (1654525526).

2265516778 is a wasteful number, since it uses less digits than its factorization.

2265516778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512477.

The product of its digits is 1411200, while the sum is 49.

The square root of 2265516778 is about 47597.4450784913. The cubic root of 2265516778 is about 1313.3760554671.

The spelling of 2265516778 in words is "two billion, two hundred sixty-five million, five hundred sixteen thousand, seven hundred seventy-eight".