77804538865 has 16 divisors (see below), whose sum is σ = 93674966400. Its totient is φ = 62037470592.

The previous prime is 77804538859. The next prime is 77804538871. The reversal of 77804538865 is 56883540877.

It is an interprime number because it is at equal distance from previous prime (77804538859) and next prime (77804538871).

It is a cyclic number.

It is not a de Polignac number, because 77804538865 - 2¹⁹ = 77804014577 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 3728581 + ... + 3749389.

It is an arithmetic number, because the mean of its divisors is an integer number (5854685400).

Almost surely, 2^77804538865 is an apocalyptic number.

It is an amenable number.

77804538865 is a deficient number, since it is larger than the sum of its proper divisors (15870427535).

77804538865 is a wasteful number, since it uses less digits than its factorization.

77804538865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23256.

The product of its (nonzero) digits is 45158400, while the sum is 61.

The spelling of 77804538865 in words is "seventy-seven billion, eight hundred four million, five hundred thirty-eight thousand, eight hundred sixty-five".