77861700017 has 8 divisors (see below), whose sum is σ = 82620640872. Its totient is φ = 73122630400.

The previous prime is 77861700013. The next prime is 77861700053. The reversal of 77861700017 is 71000716877.

It can be written as a sum of positive squares in 4 ways, for example, as 25855353616 + 52006346401 = 160796^2 + 228049^2 .

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

It is not a de Polignac number, because 77861700017 - 2² = 77861700013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77861700011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4959734 + ... + 4975407.

It is an arithmetic number, because the mean of its divisors is an integer number (10327580109).

Almost surely, 2^77861700017 is an apocalyptic number.

It is an amenable number.

77861700017 is a deficient number, since it is larger than the sum of its proper divisors (4758940855).

77861700017 is a wasteful number, since it uses less digits than its factorization.

77861700017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9935619.

The product of its (nonzero) digits is 115248, while the sum is 44.

The spelling of 77861700017 in words is "seventy-seven billion, eight hundred sixty-one million, seven hundred thousand, seventeen".