7667780656 has 20 divisors (see below), whose sum is σ = 15108129000. Its totient is φ = 3768908672.

The previous prime is 7667780651. The next prime is 7667780689. The reversal of 7667780656 is 6560877667.

It is a self number, because there is not a number n which added to its sum of digits gives 7667780656.

It is not an unprimeable number, because it can be changed into a prime (7667780651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4060381 + ... + 4062268.

It is an arithmetic number, because the mean of its divisors is an integer number (755406450).

Almost surely, 2^7667780656 is an apocalyptic number.

It is an amenable number.

7667780656 is a deficient number, since it is larger than the sum of its proper divisors (7440348344).

7667780656 is a wasteful number, since it uses less digits than its factorization.

7667780656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8122716 (or 8122710 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 58.

The square root of 7667780656 is about 87565.8646733988. The cubic root of 7667780656 is about 1971.9227327172.

The spelling of 7667780656 in words is "seven billion, six hundred sixty-seven million, seven hundred eighty thousand, six hundred fifty-six".