7776806861 has 8 divisors (see below), whose sum is σ = 7892494848. Its totient is φ = 7661290000.

The previous prime is 7776806819. The next prime is 7776806881. The reversal of 7776806861 is 1686086777.

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 7776806861 - 2¹⁴ = 7776790477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7776806797 and 7776806806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7776806881) 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, 50276 + ... + 134466.

It is an arithmetic number, because the mean of its divisors is an integer number (986561856).

Almost surely, 2^7776806861 is an apocalyptic number.

7776806861 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7776806861 is a deficient number, since it is larger than the sum of its proper divisors (115687987).

7776806861 is a wasteful number, since it uses less digits than its factorization.

7776806861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85563.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The square root of 7776806861 is about 88186.2056162981. The cubic root of 7776806861 is about 1981.2248705348.

The spelling of 7776806861 in words is "seven billion, seven hundred seventy-six million, eight hundred six thousand, eight hundred sixty-one".