777666477316 has 27 divisors (see below), whose sum is σ = 1381741645557. Its totient is φ = 382971555120.

The previous prime is 777666477251. The next prime is 777666477319. The reversal of 777666477316 is 613774666777.

The square root of 777666477316 is 881854.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 186059371716 + 591607105600 = 431346^2 + 769160^2 .

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (777666477319) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 118165146 + ... + 118171726.

Almost surely, 2^777666477316 is an apocalyptic number.

777666477316 is the 881854-th square number.

It is an amenable number.

777666477316 is a deficient number, since it is larger than the sum of its proper divisors (604075168241).

777666477316 is an frugal number, since it uses more digits than its factorization.

777666477316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300 (or 6650 counting only the distinct ones).

The product of its digits is 261382464, while the sum is 67.

The spelling of 777666477316 in words is "seven hundred seventy-seven billion, six hundred sixty-six million, four hundred seventy-seven thousand, three hundred sixteen".