78643650143 has 4 divisors (see below), whose sum is σ = 78644330688. Its totient is φ = 78642969600.

The previous prime is 78643650091. The next prime is 78643650193. The reversal of 78643650143 is 34105634687.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34105634687 = 75941 ⋅449107.

It is a cyclic number.

It is not a de Polignac number, because 78643650143 - 2¹⁴ = 78643633759 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 (78643650193) 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, 118946 + ... + 414047.

It is an arithmetic number, because the mean of its divisors is an integer number (19661082672).

Almost surely, 2^78643650143 is an apocalyptic number.

78643650143 is a deficient number, since it is larger than the sum of its proper divisors (680545).

78643650143 is a wasteful number, since it uses less digits than its factorization.

78643650143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680544.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 78643650143 in words is "seventy-eight billion, six hundred forty-three million, six hundred fifty thousand, one hundred forty-three".