78543655247 has 4 divisors (see below), whose sum is σ = 80214796896. Its totient is φ = 76872513600.

The previous prime is 78543655243. The next prime is 78543655249. The reversal of 78543655247 is 74255634587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74255634587 = 45959 ⋅1615693.

It is a cyclic number.

It is not a de Polignac number, because 78543655247 - 2² = 78543655243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78543655192 and 78543655201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78543655243) 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, 835570754 + ... + 835570847.

It is an arithmetic number, because the mean of its divisors is an integer number (20053699224).

Almost surely, 2^78543655247 is an apocalyptic number.

78543655247 is a deficient number, since it is larger than the sum of its proper divisors (1671141649).

78543655247 is a wasteful number, since it uses less digits than its factorization.

78543655247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671141648.

The product of its digits is 28224000, while the sum is 56.

The spelling of 78543655247 in words is "seventy-eight billion, five hundred forty-three million, six hundred fifty-five thousand, two hundred forty-seven".