78897080065 has 4 divisors (see below), whose sum is σ = 94676496084. Its totient is φ = 63117664048.

The previous prime is 78897080063. The next prime is 78897080089. The reversal of 78897080065 is 56008079887.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46738548481 + 32158531584 = 216191^2 + 179328^2 .

It is a cyclic number.

It is not a de Polignac number, because 78897080065 - 2¹ = 78897080063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78897079991 and 78897080009.

It is not an unprimeable number, because it can be changed into a prime (78897080063) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7889708002 + ... + 7889708011.

It is an arithmetic number, because the mean of its divisors is an integer number (23669124021).

Almost surely, 2^78897080065 is an apocalyptic number.

It is an amenable number.

78897080065 is a deficient number, since it is larger than the sum of its proper divisors (15779416019).

78897080065 is a wasteful number, since it uses less digits than its factorization.

78897080065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15779416018.

The product of its (nonzero) digits is 6773760, while the sum is 58.

The spelling of 78897080065 in words is "seventy-eight billion, eight hundred ninety-seven million, eighty thousand, sixty-five".