78868858897 has 16 divisors (see below), whose sum is σ = 85969188432. Its totient is φ = 72051517440.

The previous prime is 78868858879. The next prime is 78868858919. The reversal of 78868858897 is 79885886887.

It is a Cunningham number, because it is equal to 280836²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 8295748561 + 70573110336 = 91081^2 + 265656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78868858897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78868858897.

It is not an unprimeable number, because it can be changed into a prime (78868858097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115893 + ... + 413725.

It is an arithmetic number, because the mean of its divisors is an integer number (5373074277).

Almost surely, 2^78868858897 is an apocalyptic number.

It is an amenable number.

78868858897 is a deficient number, since it is larger than the sum of its proper divisors (7100329535).

78868858897 is a wasteful number, since it uses less digits than its factorization.

78868858897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298308.

The product of its digits is 3468165120, while the sum is 82.

It can be divided in two parts, 78868 and 858897, that added together give a triangular number (937765 = T₁₃₆₉).

The spelling of 78868858897 in words is "seventy-eight billion, eight hundred sixty-eight million, eight hundred fifty-eight thousand, eight hundred ninety-seven".