7776506866 has 4 divisors (see below), whose sum is σ = 11664760302. Its totient is φ = 3888253432.

The previous prime is 7776506831. The next prime is 7776506867. The reversal of 7776506866 is 6686056777.

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

It can be written as a sum of positive squares in only one way, i.e., 4675687641 + 3100819225 = 68379^2 + 55685^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7776506866.

It is not an unprimeable number, because it can be changed into a prime (7776506867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1944126715 + ... + 1944126718.

Almost surely, 2^7776506866 is an apocalyptic number.

7776506866 is a deficient number, since it is larger than the sum of its proper divisors (3888253436).

7776506866 is a wasteful number, since it uses less digits than its factorization.

7776506866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888253435.

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

The square root of 7776506866 is about 88184.5046819451. The cubic root of 7776506866 is about 1981.1993945604.

The spelling of 7776506866 in words is "seven billion, seven hundred seventy-six million, five hundred six thousand, eight hundred sixty-six".