158778678223 has 4 divisors (see below), whose sum is σ = 173213103528. Its totient is φ = 144344252920.

The previous prime is 158778678217. The next prime is 158778678259. The reversal of 158778678223 is 322876877851.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158778678223 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 (158778678623) 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, 7217212636 + ... + 7217212657.

It is an arithmetic number, because the mean of its divisors is an integer number (43303275882).

Almost surely, 2^158778678223 is an apocalyptic number.

158778678223 is a deficient number, since it is larger than the sum of its proper divisors (14434425305).

158778678223 is a wasteful number, since it uses less digits than its factorization.

158778678223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14434425304.

The product of its digits is 63221760, while the sum is 64.

The spelling of 158778678223 in words is "one hundred fifty-eight billion, seven hundred seventy-eight million, six hundred seventy-eight thousand, two hundred twenty-three".