6776783865 has 64 divisors (see below), whose sum is σ = 13427769600. Its totient is φ = 3222623232.

The previous prime is 6776783863. The next prime is 6776783869. The reversal of 6776783865 is 5683876776.

It is not a de Polignac number, because 6776783865 - 2¹ = 6776783863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6776783863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34102 + ... + 121311.

It is an arithmetic number, because the mean of its divisors is an integer number (209808900).

Almost surely, 2^6776783865 is an apocalyptic number.

It is an amenable number.

6776783865 is a deficient number, since it is larger than the sum of its proper divisors (6650985735).

6776783865 is a wasteful number, since it uses less digits than its factorization.

6776783865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155463 (or 155457 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 63.

The square root of 6776783865 is about 82321.2236607304. The cubic root of 6776783865 is about 1892.3779466607.

The spelling of 6776783865 in words is "six billion, seven hundred seventy-six million, seven hundred eighty-three thousand, eight hundred sixty-five".