78881938543 has 4 divisors (see below), whose sum is σ = 78882527448. Its totient is φ = 78881349640.

The previous prime is 78881938511. The next prime is 78881938547. The reversal of 78881938543 is 34583918887.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 78881938543 - 2⁵ = 78881938511 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 (78881938547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14580 + ... + 397462.

It is an arithmetic number, because the mean of its divisors is an integer number (19720631862).

Almost surely, 2^78881938543 is an apocalyptic number.

78881938543 is a deficient number, since it is larger than the sum of its proper divisors (588905).

78881938543 is a wasteful number, since it uses less digits than its factorization.

78881938543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588904.

The product of its digits is 46448640, while the sum is 64.

The spelling of 78881938543 in words is "seventy-eight billion, eight hundred eighty-one million, nine hundred thirty-eight thousand, five hundred forty-three".