2158542178 has 8 divisors (see below), whose sum is σ = 3486875868. Its totient is φ = 996250224.

The previous prime is 2158542161. The next prime is 2158542227. The reversal of 2158542178 is 8712458512.

It can be written as a sum of positive squares in 2 ways, for example, as 2157881209 + 660969 = 46453^2 + 813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41510401 + ... + 41510452.

Almost surely, 2^2158542178 is an apocalyptic number.

2158542178 is a deficient number, since it is larger than the sum of its proper divisors (1328333690).

2158542178 is a wasteful number, since it uses less digits than its factorization.

2158542178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83020868.

The product of its digits is 179200, while the sum is 43.

The square root of 2158542178 is about 46460.1138397228. The cubic root of 2158542178 is about 1292.3699353947.

The spelling of 2158542178 in words is "two billion, one hundred fifty-eight million, five hundred forty-two thousand, one hundred seventy-eight".