6977784665 has 4 divisors (see below), whose sum is σ = 8373341604. Its totient is φ = 5582227728.

The previous prime is 6977784659. The next prime is 6977784679. The reversal of 6977784665 is 5664877796.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2146283584 + 4831501081 = 46328^2 + 69509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6977784665 - 2¹⁶ = 6977719129 is a prime.

It is a super-2 number, since 2×6977784665² = 97378957662218324450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697778462 + ... + 697778471.

It is an arithmetic number, because the mean of its divisors is an integer number (2093335401).

Almost surely, 2^6977784665 is an apocalyptic number.

It is an amenable number.

6977784665 is a deficient number, since it is larger than the sum of its proper divisors (1395556939).

6977784665 is a wasteful number, since it uses less digits than its factorization.

6977784665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395556938.

The product of its digits is 106686720, while the sum is 65.

The square root of 6977784665 is about 83533.1351321139. The cubic root of 6977784665 is about 1910.9053998060.

The spelling of 6977784665 in words is "six billion, nine hundred seventy-seven million, seven hundred eighty-four thousand, six hundred sixty-five".