78550811327 has 4 divisors (see below), whose sum is σ = 80466684816. Its totient is φ = 76634937840.

The previous prime is 78550811291. The next prime is 78550811329. The reversal of 78550811327 is 72311805587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72311805587 = 7 ⋅10330257941.

It is a cyclic number.

It is not a de Polignac number, because 78550811327 - 2²⁶ = 78483702463 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 (78550811329) 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, 957936683 + ... + 957936764.

It is an arithmetic number, because the mean of its divisors is an integer number (20116671204).

Almost surely, 2^78550811327 is an apocalyptic number.

78550811327 is a deficient number, since it is larger than the sum of its proper divisors (1915873489).

78550811327 is a wasteful number, since it uses less digits than its factorization.

78550811327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915873488.

The product of its (nonzero) digits is 470400, while the sum is 47.

The spelling of 78550811327 in words is "seventy-eight billion, five hundred fifty million, eight hundred eleven thousand, three hundred twenty-seven".