2255778691 has 4 divisors (see below), whose sum is σ = 2258088552. Its totient is φ = 2253468832.

The previous prime is 2255778673. The next prime is 2255778709. The reversal of 2255778691 is 1968775522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2255778673) and next prime (2255778709).

It is a cyclic number.

It is not a de Polignac number, because 2255778691 - 2⁷ = 2255778563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2255778611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1153465 + ... + 1155418.

It is an arithmetic number, because the mean of its divisors is an integer number (564522138).

Almost surely, 2^2255778691 is an apocalyptic number.

2255778691 is a deficient number, since it is larger than the sum of its proper divisors (2309861).

2255778691 is an equidigital number, since it uses as much as digits as its factorization.

2255778691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309860.

The product of its digits is 2116800, while the sum is 52.

The square root of 2255778691 is about 47495.0385935205. The cubic root of 2255778691 is about 1311.4915495468.

The spelling of 2255778691 in words is "two billion, two hundred fifty-five million, seven hundred seventy-eight thousand, six hundred ninety-one".