78568887816691 has 8 divisors (see below), whose sum is σ = 81279077327280. Its totient is φ = 75858759473952.

The previous prime is 78568887816677. The next prime is 78568887816703. The reversal of 78568887816691 is 19661878886587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78568887816691 - 2⁵ = 78568887816659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78568887816791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12671080 + ... + 17823973.

It is an arithmetic number, because the mean of its divisors is an integer number (10159884665910).

Almost surely, 2^{78568887816691} is an apocalyptic number.

78568887816691 is a deficient number, since it is larger than the sum of its proper divisors (2710189510589).

78568887816691 is a wasteful number, since it uses less digits than its factorization.

78568887816691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30583925.

The product of its digits is 15606743040, while the sum is 88.

The spelling of 78568887816691 in words is "seventy-eight trillion, five hundred sixty-eight billion, eight hundred eighty-seven million, eight hundred sixteen thousand, six hundred ninety-one".