78668279311 has 4 divisors (see below), whose sum is σ = 78674391000. Its totient is φ = 78662167624.

The previous prime is 78668279309. The next prime is 78668279359. The reversal of 78668279311 is 11397286687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11397286687 = 6089 ⋅1871783.

It is a cyclic number.

It is not a de Polignac number, because 78668279311 - 2¹ = 78668279309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668279111) 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, 3036496 + ... + 3062293.

It is an arithmetic number, because the mean of its divisors is an integer number (19668597750).

Almost surely, 2^78668279311 is an apocalyptic number.

78668279311 is a deficient number, since it is larger than the sum of its proper divisors (6111689).

78668279311 is a wasteful number, since it uses less digits than its factorization.

78668279311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111688.

The product of its digits is 6096384, while the sum is 58.

The spelling of 78668279311 in words is "seventy-eight billion, six hundred sixty-eight million, two hundred seventy-nine thousand, three hundred eleven".