78681351911 has 4 divisors (see below), whose sum is σ = 78705190824. Its totient is φ = 78657513000.

The previous prime is 78681351907. The next prime is 78681351919. The reversal of 78681351911 is 11915318687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11915318687 = 751 ⋅15865937.

It is a cyclic number.

It is not a de Polignac number, because 78681351911 - 2² = 78681351907 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 78681351911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78681351919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11914505 + ... + 11921106.

It is an arithmetic number, because the mean of its divisors is an integer number (19676297706).

Almost surely, 2^78681351911 is an apocalyptic number.

78681351911 is a deficient number, since it is larger than the sum of its proper divisors (23838913).

78681351911 is a wasteful number, since it uses less digits than its factorization.

78681351911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23838912.

The product of its digits is 362880, while the sum is 50.

The spelling of 78681351911 in words is "seventy-eight billion, six hundred eighty-one million, three hundred fifty-one thousand, nine hundred eleven".