77706765005 has 4 divisors (see below), whose sum is σ = 93248118012. Its totient is φ = 62165412000.

The previous prime is 77706764999. The next prime is 77706765007. The reversal of 77706765005 is 50056760777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50056760777 = 151 ⋅331501727.

It can be written as a sum of positive squares in 2 ways, for example, as 60031860196 + 17674904809 = 245014^2 + 132947^2 .

It is not a de Polignac number, because 77706765005 - 2⁸ = 77706764749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77706765007) 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 3 ways as a sum of consecutive naturals, for example, 7770676496 + ... + 7770676505.

It is an arithmetic number, because the mean of its divisors is an integer number (23312029503).

Almost surely, 2^77706765005 is an apocalyptic number.

It is an amenable number.

77706765005 is a deficient number, since it is larger than the sum of its proper divisors (15541353007).

77706765005 is a wasteful number, since it uses less digits than its factorization.

77706765005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15541353006.

The product of its (nonzero) digits is 2160900, while the sum is 50.

The spelling of 77706765005 in words is "seventy-seven billion, seven hundred six million, seven hundred sixty-five thousand, five".