78661416687 has 32 divisors (see below), whose sum is σ = 120348868608. Its totient is φ = 44768279136.

The previous prime is 78661416683. The next prime is 78661416749.

78661416687 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78661416687 - 2² = 78661416683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78661416687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78661416683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5969368 + ... + 5982530.

It is an arithmetic number, because the mean of its divisors is an integer number (3760902144).

Almost surely, 2^78661416687 is an apocalyptic number.

78661416687 is a deficient number, since it is larger than the sum of its proper divisors (41687451921).

78661416687 is a wasteful number, since it uses less digits than its factorization.

78661416687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14299.

The product of its digits is 16257024, while the sum is 60.

The spelling of 78661416687 in words is "seventy-eight billion, six hundred sixty-one million, four hundred sixteen thousand, six hundred eighty-seven".