2680778663 has 4 divisors (see below), whose sum is σ = 2707321128. Its totient is φ = 2654236200.

The previous prime is 2680778641. The next prime is 2680778677. The reversal of 2680778663 is 3668770862.

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

It is a cyclic number.

It is not a de Polignac number, because 2680778663 - 2²⁰ = 2679730087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2680778063) 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, 13271081 + ... + 13271282.

It is an arithmetic number, because the mean of its divisors is an integer number (676830282).

Almost surely, 2^2680778663 is an apocalyptic number.

2680778663 is a deficient number, since it is larger than the sum of its proper divisors (26542465).

2680778663 is a wasteful number, since it uses less digits than its factorization.

2680778663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26542464.

The product of its (nonzero) digits is 4064256, while the sum is 53.

The square root of 2680778663 is about 51776.2364700255. The cubic root of 2680778663 is about 1389.1644242265.

The spelling of 2680778663 in words is "two billion, six hundred eighty million, seven hundred seventy-eight thousand, six hundred sixty-three".