78538810043 has 4 divisors (see below), whose sum is σ = 78559520088. Its totient is φ = 78518100000.

The previous prime is 78538810037. The next prime is 78538810061. The reversal of 78538810043 is 34001883587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78538810043 - 2⁴ = 78538810027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78538810043.

It is not an unprimeable number, because it can be changed into a prime (78538110043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10349333 + ... + 10356918.

It is an arithmetic number, because the mean of its divisors is an integer number (19639880022).

Almost surely, 2^78538810043 is an apocalyptic number.

78538810043 is a deficient number, since it is larger than the sum of its proper divisors (20710045).

78538810043 is a wasteful number, since it uses less digits than its factorization.

78538810043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20710044.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 78538810043 in words is "seventy-eight billion, five hundred thirty-eight million, eight hundred ten thousand, forty-three".