6977784664 has 32 divisors (see below), whose sum is σ = 13168189440. Its totient is φ = 3466314400.

The previous prime is 6977784659. The next prime is 6977784679. The reversal of 6977784664 is 4664877796.

It is a junction number, because it is equal to n+sod(n) for n = 6977784596 and 6977784605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1481337 + ... + 1486039.

It is an arithmetic number, because the mean of its divisors is an integer number (411505920).

Almost surely, 2^6977784664 is an apocalyptic number.

It is an amenable number.

6977784664 is a deficient number, since it is larger than the sum of its proper divisors (6190404776).

6977784664 is a wasteful number, since it uses less digits than its factorization.

6977784664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5871 (or 5867 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 64.

The square root of 6977784664 is about 83533.1351261282. The cubic root of 6977784664 is about 1910.9053997147.

The spelling of 6977784664 in words is "six billion, nine hundred seventy-seven million, seven hundred eighty-four thousand, six hundred sixty-four".