7768713661 has 8 divisors (see below), whose sum is σ = 7964982648. Its totient is φ = 7572768000.

The previous prime is 7768713653. The next prime is 7768713671. The reversal of 7768713661 is 1663178677.

7768713661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3205711161 + 4563002500 = 56619^2 + 67550^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7768713661 - 2³ = 7768713653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7768713599 and 7768713608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7768713671) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31800 + ... + 128641.

It is an arithmetic number, because the mean of its divisors is an integer number (995622831).

Almost surely, 2^7768713661 is an apocalyptic number.

It is an amenable number.

7768713661 is a deficient number, since it is larger than the sum of its proper divisors (196268987).

7768713661 is a wasteful number, since it uses less digits than its factorization.

7768713661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161663.

The product of its digits is 1778112, while the sum is 52.

The square root of 7768713661 is about 88140.3066763442. The cubic root of 7768713661 is about 1980.5373555134.

The spelling of 7768713661 in words is "seven billion, seven hundred sixty-eight million, seven hundred thirteen thousand, six hundred sixty-one".