78538398946423 has 4 divisors (see below), whose sum is σ = 84579814250008. Its totient is φ = 72496983642840.

The previous prime is 78538398946421. The next prime is 78538398946453. The reversal of 78538398946423 is 32464989383587.

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 78538398946423 - 2¹ = 78538398946421 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 (78538398946421) 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, 3020707651773 + ... + 3020707651798.

It is an arithmetic number, because the mean of its divisors is an integer number (21144953562502).

Almost surely, 2^{78538398946423} is an apocalyptic number.

78538398946423 is a deficient number, since it is larger than the sum of its proper divisors (6041415303585).

78538398946423 is a wasteful number, since it uses less digits than its factorization.

78538398946423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041415303584.

The product of its digits is 7524679680, while the sum is 79.

The spelling of 78538398946423 in words is "seventy-eight trillion, five hundred thirty-eight billion, three hundred ninety-eight million, nine hundred forty-six thousand, four hundred twenty-three".