2158677218 has 4 divisors (see below), whose sum is σ = 3238015830. Its totient is φ = 1079338608.

The previous prime is 2158677203. The next prime is 2158677299. The reversal of 2158677218 is 8127768512.

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

It can be written as a sum of positive squares in only one way, i.e., 1698016849 + 460660369 = 41207^2 + 21463^2 .

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 as a sum of consecutive naturals, namely, 539669303 + ... + 539669306.

Almost surely, 2^2158677218 is an apocalyptic number.

2158677218 is a deficient number, since it is larger than the sum of its proper divisors (1079338612).

2158677218 is a wasteful number, since it uses less digits than its factorization.

2158677218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079338611.

The product of its digits is 376320, while the sum is 47.

The square root of 2158677218 is about 46461.5671065882. The cubic root of 2158677218 is about 1292.3968853734.

The spelling of 2158677218 in words is "two billion, one hundred fifty-eight million, six hundred seventy-seven thousand, two hundred eighteen".